Similar stats as you, a little bigger @ 5'6/118. Ditto the 166. How: because there is considerable tip rocker on the Black Pearl. In order to engage the tips, a lot of forward pressure on the tips is required. I don’t think it’s the actual length of the ski that’s a problem - but the huge tip rocker is.
I was going to mention this before things got uber-technical with stance discussion. Your idea of switching up skis is a good one. Next up, if possible/feasible, would be to try your old boots with new skis. Process of elimination?
I was skiing tough conditions (very heavy snow, slick where groomed, mashed and refrozen where not), and the amount of forward pressure I had to exert on the skis to maintain tip contact - and in a new, more upright boot cuff - created intense shin burn and pain, the likes of which I haven’t felt in decades. It’s 10 days later, and some of the muscles around one shin are STILL sore.
Conditions were nowhere near this tough the next time out, but I was back in old (still fairly new) boots and old skis. No issues, not like this. Next up for me is new boots/old skis.