Ouch!
The Cartech is a "touchy" unit - it's easy to get too much fuel. They provide a "reducer" with it - a little plastic thingie that you insert into your vacuum/boost line to restrict the flow. I have to use that, or else even on the minimum setting the Cartech delivers way too much fuel.
I gather from your mods that you are just using the Cartech to try and get a little bit richer under open loop/WOT. That is totally possible if you set it up right. Here's a good starting point:
1) use the reducer
2) back the adjusting screw out all the way
3) if you have the model with the adjustable onset, set it about the middle of it's range.
Can you tell me exactly which model of the Cartech you have? That will help.
Also - do you have a gauge yet? Unless you have lots of free dyno time, it is virtually impossible to tune fuel pressure w/o a gauge. And the "under-the-hood" gauges are only good for tuning your base fuel pressure. Since the Cartech only works under boost, and you only get boost under load, you need an in-cockpit gauge to monitor pressure under driving conditions.
Another way to get ballpark A/F w/o a dyno is Vag-Com logging block 031. Look at the rear O2 sensor voltage, under WOT in 3rd and 4th gear it should be .89-.91 volts. If you're getting .93, you are really too rich. Less than .87 is way too lean.
If you are still flooded, try the age-old trick of holding the throttle all the way open. At startup, this will get more air into the engine.
And what model is your car? If you have an AEB engine (cable-throttle), the K04 kits can be much improved with 310cc injectors, a 3 bar FPR, and the "PC16" file from GIAC:
http://www.clubb5.com/forums/viewtopic.php?t=75829