Best configuration?

[pheeos]

Hi folks!
I run an Erl2D in my Opel Speedster 2.2 TurboConversion by Gruber. My maximal boost is 0.6bar. I used the middle-size jet to inject directly above the throttlebody. Mixture is 50/50 water/methanol.
When injecting, i feel a loose of power. without WI the engine responds better. Am I injecting too much water? How much can I increase the boost without risking too much? Are there other things that could be wrong?
Would a pre-turbo injection be better for my configuration?
Many question from a newbie, hope you can answer some..!

Thanks a lot!

michael from germany