Firstly, nice car you have there. A few of these remap places let you try out the remap first before parting with your cash.
I suppose the reason why I am not surprised that you wont gain a big performance difference is because its NA and not a turbo. I'd say give it a shot and if you are pleased with the slight increase in speed and more torque, go for it.
As for RPM, I'd probably say leave it as it in, running the engine at high speed wont be nice on the engine, especially if you are always ragging it.