On taking them out yesterday to test the Amplifier Module, I found that the Velcro I used sticks to itself better than it sticks to the tank

I cleaned the painted hull sides with water first, then IPA, so there shouldn't have been any dust, dirt or grease to affect the adhesion.
Anyone else found this

I was using 10mm wide strip, for the whole length of the module, but I think I'll strip that all off and try 25mm strip in smaller lengths instead.
Adrian.