bangle js1 draw speed flicker

I'm working on an analog watchface using drawn objects such as g.fillCircle, g.fillPoly, etc.
I have about 15-20 shapes being drawn, and I'm seeing a flicker every second, which is consistent with my setInterval rate. The whole thing flickers for the tiniest fraction of a second, but is noticable enough to be annoying. I'm noticing that the last things drawn (the clock hands) flicker a little darker than the first things drawn (the 12 and 1 hour markers) so I figure the tiny moment of flicker I'm seeing is the time it takes to draw each object after g.clear is called.

I get no flicker when running the same app on the js2, and I'm not sure if it's a difference in processor speed, or refresh rate of the different LCDs.

I also tried removing the anti-aliasing options where possible, but that didn't improve the draw time at all, so I put it back.

Anyway I'm not sure if I'm doing something wrong, or if I've simply hit the limits of the device, but I'll post my code here and hope that someone can spot my issue, or clue me in to a workaround. Thanks!

// Load fonts
require("Font7x11Numeric7Seg").add(Graphics);
// position on screen
const xc = 120, yc = 133;
let twoPi  = 2*Math.PI;
  let Pi     = Math.PI;
  let halfPi = Math.PI/2;

function glowface() {
  g.reset();
  g.clear();
  //TopDot
  g.setColor(0,1,0.62);
  g.drawCircleAA(120,4,4);
  g.fillCircle(120,4,3);
  //HourMarkers
  g.setColor(0,1,1);
  g.fillRect(123,37,128,57);
  g.drawCircleAA(164,54,5);
  g.fillCircle(164,54,4);
  g.drawCircleAA(197,87,5);
  g.fillCircle(197,87,4);
  g.fillRect(212,129,214,135);
  g.drawCircleAA(197,176,5);
  g.fillCircle(197,176,4);
  g.drawCircleAA(164,208,5);
  g.fillCircle(164,208,4);
  g.fillRect(111,37,116,57);
  g.drawCircleAA(75,208,5);
  g.fillCircle(75,208,4);
  g.drawCircleAA(42,176,5);
  g.fillCircle(42,176,4);
  g.fillRect(25,129,45,135);
  g.drawCircleAA(42,87,5);
  g.fillCircle(42,87,4);
  g.drawCircleAA(75,54,5);
  g.fillCircle(75,54,4);
  g.fillRect(117,206,122,226);

  let now = new Date();
  let Hours   = now.getHours() % 12;
  let Minutes = now.getMinutes();
  let Seconds = now.getSeconds();
  let HoursAngle   = (Hours+(Minutes/60))/12 * twoPi - Pi;
  let MinutesAngle = (Minutes/60)            * twoPi - Pi;
  let SecondsAngle = (Seconds/60)            * twoPi - Pi;
  //Hours
  let hSin = Math.sin(HoursAngle), hCos = Math.cos(HoursAngle);
  g.setColor(0,1,1);
  g.drawCircleAA(xc-57*hSin,yc+57*hCos,4);
  g.fillCircle(xc-57*hSin,yc+57*hCos,3);
  g.drawLineAA(xc-52*hSin+5*hCos,yc+52*hCos+5*hSin,xc-20*hSin+5*hCos,yc+20*hCos+5*hSin);
  g.drawLineAA(xc-52*hSin-5*hCos,yc+52*hCos-5*hSin,xc-20*hSin-5*hCos,yc+20*hCos-5*hSin);
  //Minutes
  let mSin = Math.sin(MinutesAngle), mCos = Math.cos(MinutesAngle);
  g.setColor(0,0,0);
  g.fillPolyAA([xc-96*mSin,yc+96*mCos,
                xc-78*mSin-11*mCos,yc+78*mCos-11*mSin,
                xc-14*mSin-5*mCos,yc+14*mCos-5*mSin,
                xc-14*mSin-5*mCos,yc+14*mCos-5*mSin,
                xc-14*mSin,yc+14*mCos,
                xc-16*mSin,yc+16*mCos,
                xc-16*mSin-1*mCos,yc+16*mCos-1*mSin,
                xc-77*mSin-7*mCos,yc+77*mCos-7*mSin,
                xc-77*mSin+7*mCos,yc+77*mCos+7*mSin,
                xc-16*mSin+1*mCos,yc+16*mCos+1*mSin,
                xc-16*mSin,yc+16*mCos,
                xc-14*mSin,yc+14*mCos,
                xc-14*mSin+5*mCos,yc+14*mCos+5*mSin,
                xc-14*mSin+5*mCos,yc+14*mCos+5*mSin,
                xc-78*mSin+11*mCos,yc+78*mCos+11*mSin
                ]);  //minuteHandShadow
  g.setColor(0,1,0.62);
  g.fillPolyAA([xc-91*mSin,yc+91*mCos,
                xc-80*mSin+7*mCos,yc+80*mCos+7*mSin,
                xc-80*mSin-7*mCos,yc+80*mCos-7*mSin]);
  g.drawLineAA(xc-76*mSin+9*mCos,yc+76*mCos+9*mSin,
               xc-17*mSin+3*mCos,yc+17*mCos+3*mSin);
  g.drawLineAA(xc-76*mSin-9*mCos,yc+76*mCos-9*mSin,
               xc-17*mSin-3*mCos,yc+17*mCos-3*mSin);
  //Seconds
  let sSin = Math.sin(SecondsAngle), sCos = Math.cos(SecondsAngle);
  g.setColor(0,0,0);
  g.drawCircleAA(xc-64*sSin,yc+64*sCos,4);
  g.fillCircle(xc-64*sSin,yc+64*sCos,3);
  g.fillPolyAA([xc+1*sCos,yc+1*sSin,
                xc-1*sCos,yc-1*sSin,
                xc-102*sSin,yc+102*sCos]);
  //g.drawLineAA(xc,yc,xc-102*sSin,yc+102*sCos);  
  g.setColor(0,1,1);
  g.drawCircleAA(xc-64*sSin,yc+64*sCos,2);
  g.fillCircle(xc-64*sSin,yc+64*sCos,1);
}

var secondInterval = setInterval(glowface, 1000);
// Stop updates when LCD is off, restart when on
Bangle.on('lcdPower',on=>{
  g.clear();
  if (secondInterval) {clearInterval(secondInterval);
  secondInterval = undefined;}
  if (on) {
    secondInterval = setInterval(glowface, 1000);
    glowface(); // draw immediately
  }
});
glowface();

// Show launcher when middle button pressed
Bangle.setUI("clock");