Well, I think that IRace pro is totally different from an SL ski, IRace pro will give you only a more reactive feeling compared to a Race Carve R17/18. Two years ago, I saw Alessandro Fattori ski instructor and ex top world cup racer using IRace pro 175. That said at your level you can use 180 and have fun, we can say in your case it's a metter of presonal taste. Another small tip is to use a boot not those are used in training or real races, but a shop race 130, those not reserved for agonists to uderstand us. I tell you this tip because especially in the short turn you don't need to have all this responsiveness and quick impulse.
Sorry for bad English hope this help.
Thank you very much(i guess the web traslator didn't do much job).
Only two questions about that you said because i didn't understand. 1. That you said about the ski istructor skiing in 175 and that i would do ok in 180. Can you explain?
2. The Fischer rc4 curv 130 is not official race model. It's normal merchandise boot. I don't understand either. Sorry. Must or must not to use normal 130 boots?
I want very much your opinion. So if you can please explain to me. Thank you.