Replying to On3p Kartel mounting question

So I have a pair of 186 Kartel 98's mounted at recommended but I feel like I'm not getting all I can out of them in the park. Would mounting them again at -1 from true centre affect their all mtn performance too much? I'm also worried that 186 is a tad long for the park and I should keep them at rec for all mtn and just buy a park ski. Thinking of just pickin up some 181 Magnus for the park but I feel like theyre almost too similar to justify having both skis. I ride 50/50 park and am 5'11. Been skiing for 20+ years and like to charge however still like to progress in the park. Any thoughts?