When I have my hand through the bass strap in the centre everything is ok and I can reach a few bass buttons without having to move my hand much. But I'm finding it a struggle when I have to move my hand up or down as the bass strap gets tighter and I am struggling a bit to get my hand in the correct position to play the chords I need to play (on my Roland this is down around Bb & Eb). I've done I rubbish sketch to show what I mean:

If I slacken the bass strap then when playing around the centre of the accordion the strap is far too loose. How do you guys get around this?
I'm also finding that my hand gets a bit sweaty and this is also causing my hand to stick to the accordion a bit which isn't helping either.

If I slacken the bass strap then when playing around the centre of the accordion the strap is far too loose. How do you guys get around this?
I'm also finding that my hand gets a bit sweaty and this is also causing my hand to stick to the accordion a bit which isn't helping either.