If your coil packs are in good condition then 1.1mm should be fine. Unless you are running big power/boost it should be fine and more to the point desirable to run the larger gap to provide the best combustion.
The stagea was running a 1.1mm gap with splitfires and 18psi with the GT-RS and no misfires. With the 2835ProS it is only running 16psi but making a bit more power still with no issues.