well 107 and 109 sound way low... my 4mil with 22cc domes is getting 145 and 141.....
66mm isnt stoke, stock bore is 64mm
i have 4mil and run 22 domes... runs fine, what type of riding you do? if your not racig alot then id stick with the 22's if you go higher then your going to have to run higher octane. you should be able to get away with 104 octane maybe a little lower ... now that assuming you get your compressio backup like it should be.