Hi Eddie, sounds like your not keen on how the new wheels make the car handle, is that correct?
Down to personal choice at the end of the day. But 19' can be a little big for the mk5 if tyre/offset combo isn't correct. 235/40's a little big really, 225/35's would be better, but understand have just bought them so don't want to change the tyres. Do you still have the 18's? If so you could quickly put them back on and go for a drive, if you prefer how car handles/feels then I think your mind has been made up for you.
Could even weigh both wheels, be surprised how much difference that makes to how are car goes, turns and stops. I went from Monzas to TD Pro Race and noticed a difference.
Could always sell the 19's, might lose a little money, but your be happier in the long run.
The looks of a wheel plays a massive part, but how the car handles on a daily basis far more important as you have to live with it.
I personally felt your car looked great on the 18's. Maybe some BBS VZ instead.
Si