Pico power consumption down to 0.02mA

Hi,
let me renew the "Pico power consumption" issue.

I have Espruino Pico v1.4 (fw 2v01) and tried to reach as less consumption as possible using LiPol 3.7V 1100mAh.

My code and test results:

// test 1.1: **~460uA**
digitalRead([B15,B14,B13,B10,B1,A7,A6,A5,A4,A3,A2,A1,A0,A10,B9,B8,A8,B7,B6,B5,B4,B3]);
setInterval('digitalPulse(LED1,1,10)',5000); 
setDeepSleep(1);

// test 2.1: **~500uA**
digitalRead([B15,B14,B13,B10,B1,A7,A6,A5,A4,A3,A2,A1,A0,A10,B9,B8,A8,B7,B6,B5,B4,B3]);
setSleepIndicator(LED1); 
setInterval(function() {}, 5000);
setDeepSleep(1);

// test 3.1: **~400uA**
digitalRead([B15,B14,B13,B10,B1,A7,A6,A5,A4,A3,A2,A1,A0,A10,B9,B8,A8,B7,B6,B5,B4,B3]);
setInterval(function() {
  digitalWrite(LED1, 1);
  setTimeout(function () {
    digitalWrite(LED1, 0);
  }, 20);
}, 5000);
setDeepSleep(1);

Unfortunately, no pins are grounded.

Could you tell me, how is grounding important for this issue? What can be suggested else to reduce consumption?

In fact, "pin grounding" is not good for me. Because entire B3-B7, A8 are linked with InAir9b module.