Do you have this brake? I don’t think is a65 but was fitted to gold stars and some a10s. It’s actually on my b31. I think I heard the a65 version has extra ribs in the drum?
I got this brake to work REALLY well by building up the leading shoe flat cam surface 020” with weld, so it contacts the hub first. I have longer term plans to reverse the brake lever to achieve the same effect, once I get the shoes relined, I’ll also remove the weld when I do that.
I’ve not heard of the floating shoe mod, sorry.