Thanks guys for all the suggestions. I had tried everything except for two things:

1. The new strap - which I'll keep as a last resort as it involves spending money and getting stuff from the US
2. One electrode on the front and one on the back - worked today for about 2 hours, but then so has other positions.

Now that one electrode front and one back seems to work, I have to see if it works consistently over multiple rides.


This is the new strap which was suggested on BF.