@foxriverat it depends a little what you're working on, but I personally don't think 67" is too long for you. At -35 off maybe. At -15off I think the issues are usually about getting enough pull/leverage, not about getting a tight-enough turn, so in my mind, long is better than erring on the short side at this stage. Moreover, as you start progressing into shortline, it's often good to drop the boat speed to 32mph to practice a new length, so again, longer is better than too short.
For what it's worth - and I think I mentioned this on your other thread last month - but I'm about 10+ lbs heavier than you, was on a 66" KD7000, was on the edge of buying a Senate C, then grabbed a 66.5" S2. It wasn't love-at-first-ski, but within 3-5 sets we started to get along, it's done well by me, I'm up 6.5 balls on my PB this season.