To be fair I haven't been in a tuned Cupra. All I can say that Stage 1 is in a totally different league to standard.
My aim was only to extract a little more power, hence picking the BF over the Revo or similar.
You do realise you can detune the likes of a Revo map to wherever it suits you though dont you?
You have 3 settings
1) Boost
2) Timing
3) Fuel
Pretty simple especially as you have it set for you by the reseller, and on a stock car, this will be Boost 6, Timing 5 or 6 and Fuel 9 for performance settings, and these settings are well within fuelling and boost limits of the car on stock components.
"Standard" for Revo is Boost 6, Timing 3 and Fuel 9.
If you ran Boost 6, Timing 4 and Fuel 9 you would be somewhere between and have the increase you want.
You only need to look through the forum to see how many people have a remap and have absolutely no issues - regardless of which map from APR to GIAC to Revo to some of the smaller companies.
I can understand your trepidation - something most people will have when "tinkering" with their car for the first time, but I think you have been desparately unlucky with SC although it appears to me at least that they seem to have more issues than the other tuning companies with regard to their maps and support from what I have read on this and other forums which is a shame considering theirs is the only map which would be invisible to stealers.
Perhaps if you got a run in a tuned Cupra which has no issues, you will change your mind. If you are keeping the car, I think you are going to miss out on something special. Dont give up mate - try another remap. You WILL love it