Ben6

Got a 1984 fantic 240 and it's always had weak brakes. Just put new shoes new cable and lever on it but it has made little difference. I've tried to leave everything loose cable tie the brake on and then tighten everything up but still the brakes are weak. The brakes bite but the lever still feels spongey and pulls nearly all the way to rhe bars after it bites. I've seen on here somewhere that the centre hole on the backing plate can be opened by 0.5mm ish to help centralise the the shoes in the drum. Is this my best chance of getting better brake performance before I go and enlarge the hole? Thanks for any replies!😁