To Uhhpunkk for us blowing up her thread
This place is full of fanstastic information and about 3 times as much bickering and useless arguing. Sorry your question got sucked into the latter.
To summarize the useful info and give you the answer we should have given you:
Your board is not bad for you now. It is on the long side but there is nothing wrong with that and it wont necessarily hold you back. The Wonder is an awesome deck, keep it. If you are really interested in progressing specifically in the park and you do want another board, there is no reason why you cant get a second one. One with attributes better suited towards a park specific style of riding. With all that, proper technique is more important than a short soft board, so with presses specifically if you pick something well sized and not a pure street jibstick, you'll probably still have some difficulty getting it fully bent out.
If you want some recommendations on size and models, let us know.