I was wondering if anyone had any tips on getting the Velcro on the plate carries front flap an cumberbund to stick better
Depends what the problem is? Sometimes we just unluckily get a piece of bad gear. I had one once. I used a small craft knife to cut out the bad Velcro and super glued new Velcro on.
I apply double sided sticky tape: or sometimes replace velcro with my own
Same as BigD, double sided tape is my go-to