Take off -high and -heapsize from your launch option and look into overclocking your CPU. There's plenty of guides you can google for your CPU to get you started. You should be able to get a bit over the 3.5 you mentioned. Don't worry too much about overclocking. As long as you can follow a reputable guide and can realize what you should be doing from it, than it's pretty hard to damage your hardware.
Other than that, there isn't much that would be holding you back. I could get a constant 132 back when I had a core 2 duo @ 4GHz about a year ago.