Chucky isnīt there a tech at the shop where you bought the new GC unless you bought it online of course?
On the internet there are dozen of website devoted to upgrading GCs and giving advice and with Q and AS.Might not hurt to read some of them see if somebody did not have a similar problem and how it was solved.
I donīt think going back to your old GC is the solution though
.With Kursk coming soon you need the best performance.
All the best!