That'll help, especially if you want to progress freestyle. You might be able to even go down to 148/147 range, though you'll be giving up a lot of the versatility a 150 would give you. A good rule of thumb is if the board feels too big and unwieldy, it probably is. That's why preference, style and weight are the most important factors to detertmine size.
As for those two specific boards, I've never ridden them and have no experience with them but I would venture a guess and say you're going to like either much more than a Forum F10 157 for progressing your riding just based on size.
Some boards, both men's and womens you could look at for all around freestyle would be:
Forum Destroyer/Destroyer DoubleDog
NeverSummer Pandora(w), Evo, Proto-CT
Bataleon Whatever, FunKink, Evil Twin
A size 9 womens is about a size 8 mens so you shouldn't have too many problems rocking a mid width men's board.