Does anybody here have piston seal problems as I do with them?

I had the calipers rebuild several years ago. Cylinders were sleaved with stainless,new pistons,seals.
Everytime I pull a caliper from the rotor a piston seal starts leaking. I installed longer wheel studs in my rotors today for a rim change. When I slid the caliper off it was fine, when I compressed the pads to slide back over the rotor one started seaping fluid... All of them are clean no sticking or binding pistons. I am pretty fed up with them after several years, I have been through 3 wheel seal kits..

Anyone know of a decent aftermaket caliper that is a direct fit with our spindle mounting plates? Thanks