Yes, the SFR is too close to the Karver.
Go for the S2 which is a great allround (smallish) size 245 cm2.
I got a 233 cm2 as my big stab, and a 175 cm2 as my small stab.
Usually I use my big stab with my WaveXL 790 cm2, as this wing turns so fast that I like the "drive" from a tad bigger stab.
Whereas with the Kool 1200 cm2 wing I use the smallest stab, so it gets fun and lively despite of the big wing.
Maybe quite opposite to what others do, but it works perfectly for me, balance on both wings