We had no cycling issues using oem recoil springs with factory loaded 115 and 124 gr ammo. Just the same, we'd still recommend using 15lb springs. These guns are very over sprung from CZ. If you're shooting anything weaker than factory ammo, going down to 13 or possibly even lower probably wouldn't be a bad idea. Of course, the general idea is to give a comp as much gas as you can to work it. The weaker the anmo, the less the comp is going to do for you.
The set screws install from under the comp so it keeps a cleaner look. Red loctite for bbl threads and blue for set screws is all provided.