Warrior General Games

i have a level 57 CB with 16 SV (8 natural), it will be 18 after a couple more BT upgrades.
Question is if 18 is overkill and maybe i should shop for a different piece of AE and go with 5 in SV and 5 in maybe SDC if i am lucky enough to find a piece, or something else

That's a lot but there's nothing you can really do about it, you already have the piece and the 8 natural. If you happened to find a SDC piece and you only have 1 or 2 natural SDC then yes, switch them, but it's not a big deal unless you can find a better piece (5% PD or SDC) (imo)