Hi, I just picked up a CZ tactical sport orange and a Accu Shadow 2. Im shooting box range ammo through them. Mostly Fiocchi and Magtech 115 gr and 124 gr. I was wondering what would be a good pound recoil spring to use in each of these guns? The TSO comes with a 16 # which I feel is on the heavy side and the Accu shadow 2 comes with an 11# which I feel is a little light. I was thinking a 13# for the tso and a 12# for the Accu shadow. Im not shooting any competitions these are just for the range. Just looking for them to be reliable and have no issues. Any help appreciated.