Replying to Will new skis make me a better skier

Currently I am skiing an old set of 171 line anthems (the ones with the snowboarder graphic, i believe it's the 2010 model). I've owned these for a few years now, but only last year did I start to spend the majority of my time in the park. I'm a strong all mountain skier who is comfortable at speed, and I'm currently hitting medium sized rails and jumps. Generally I'm working on hitting things comfortably with either foot forward, switch ups, and 270s out. I haven't started spinning off anything other than small jumps. With all this being said, do you guys believe I would be able to progress faster if I were to transition from this 7 year old ski to something newer?

I'm familiar with the kinds of improvements that can be seen when switching to a better all mountain ski, but I don't understand how these things would translate with a park ski. As far as I can tell, a change in skis won't help me balance better on a rail or spin any faster. The only significant changes I can imagine are that the ski may have more responsive flex and better pop underfoot. Now, this is not to say that I don't believe a newer, more expensive park ski truly is better. The question is, HOW are they better, and will someone at my ability level be able to benefit from those improvements.

In the event that the answer is yes and this turns into a recommendation thread, let me provide a little more information. I would be using this ski exclusively for park, I'm more interested in jibbing than hitting jumps, I like to butter, I'm 6' 165lbs, I ski at Mt. Snow in VT, and I'd like to spend under 500 (without bindings) unless you have a damn good reason to convince me otherwise (I'm open to used options).

Thanks for any help yall can offer. Cheers!