I am actually pretty close to your build. I've been riding about 30 times/year over the last 12 seasons so I'm fairly advanced. Heres my stats and boards
GNU ladies park pickle 140cm
Lib Tech TRS 148 cm
I definitely can tell you that 148 is at the outer limit for the length of boards girls our size should be riding. I definitely cannot throw around my TRS like I can my GNU, but I dont need to since I bought the board for charging and stability at high speeds which is exactly what it does.
I originally bought my GNU for park and all-mountain. I also do basic park stuff, grabs, 50-50s, boardslides on any features I can find with only that board. I also go to mount bohemia which is like midwest backcountry because I love tree runs but the wide open runs ride like moguls when it gets tracked out. I rode my TRS (the long board) and it was pretty challenging to turn on a dime through the trees, moguls and chop because of the length and weight. But it was AWESOME in the pow.
I can't imagine trying to do park with a board that long as a female rider, I just don't have the muscle to pop and spin a board that big. Not that it can't be done. Basically what it comes down to is that your ladies choice is an awesome board for all-mountain, the longer the more stable, but is not exactly ideal for your park riding. I would either keep your board and get a park specific board (onyx, infinity, gypsy, forum spinster) and switch between the two (which is what I do), or ditch that board and get something that can do both reasonably well in a 143-144.
If you go any softer with the flex your going to sacrifice its all-mountain performance, the ladies choice is still a medium flex. All those boards you mentioned besides the ollie pop are definitely park oriented. Now that I've progressed with my TRS I get back on my softer, rockered GNU board and it feels a bit surfy and out of control at high speeds.
I also agree with lander91, your rome was a rocker which initiates turns really easily because theres less edge contact, but your GNU is gonna ride more aggressive and has some camber thrown in the mix so itl be harder to turn
Sorry for the long post! Hopefully something in there was helpful