No, there is nothing wrong with that much oil. However, if it was tuned/jetted for less oil ratio, adding oil will lean the fuel mixture out, increasing chances of detonation.
+5 timing normally would be OK. Advancing timing will usually make it run better. But, more timing also increases chances of detonation.
I stated before that 18cc domes are to small for pump gas, especially on a 4mil stroker. You should do a compression test to be sure. High compression and too low of octane fuel increase chances of detonation.
Anytime you build a motor, you should do a compression test, check squish, and do a leak down test before running it. After all this and getting it running, do a plug chop or two until you are sure everything is good. If you buy a motor or bike already running, it would be wise to do the same thing. A little investment of time will save $$ in the long run.