Do you remember which width Black Pearl you were on? Thanks for mentioning this on the length, given how much taller you are than me it makes me feel much better about a 150s length for bumps!
I was on the 82. Incidentally, my telemark ski is a 166cm Black Pearl 82. My all mountain alpine ski is a 170cm Black Pearl 88.
I've skied on a 163cm K2 mogul ski at 64cm underfoot! Too quick for me in the bumps, but super fun, and I also skied it all over the mountain with no issues. It's just about balance, and you don't have to worry about that.
I say that to reiterate that even though I'm quite bigger than you are, I can ski a shorter ski as well, not to say get a mogul ski. Mogul skis are QUICK.
Don't overthink this! If you find a good deal on the Black Pearl 78, or the older Cheyenne, grab it! And then don't go wondering if the Astral would've been better!
Get whatever you get the best deal on. A benefit of the BP....still fun carving the groomers going back to the lift. You won't feel as if you need to switch skis. Even if you find the best deal on the 82mm Black Pearl, that would be good, too!