A5h: you have alot to learn mate. I would be booking yourself in at an advanced driver training course asap.
Putting your car sideways in the middle of a street because you dont know how the car behaves is not a good thing.
Boost on your car being a stock turbo will come in early, from memory on my old car anywhere from 2500rpm - 3000rpm.
Chances are although you claim to have being doing 40, the revs were at a high enough level that boost was instant.
I dont recommend you plant your foot on the gas especially if its wet.
Considering you are relatively inexperienced driving a turbo car i suggest you have the boost checked and have it returned to stock if it isnt already. There is no need for you to be running higher boost until you can handle the cars factory power.
If you have FM901's on the back at least ,you have some very good tyres there, stick with them