you can definitely add some timing here, also you need to log cam events for intake and exhaust and I didn't see VCT schedule mode being logged. The 15s will never go to OP spark table but they will follow the OP cam tables as designated
Kind of new to Flex Fuel as well. My log is running E60. You'd have to post your tune for people to look over. Seems that in the 15/16's OP mode isn't normally enabled but you'll see from my log that the VCT mode actually does hit OP mode just not the mapped points for spark.