I think @huskihl
and I are getting at the same thing. Cold air can’t enter the transfer tunnels until the piston windows crack above the floor of the transfer uppers. The other cold air openings in the intake spigot must also be open, but can be ahead and often are. On an XT reading the uppers is easy because you can take the transfer covers off. There may be a trick on saws without covers, my way is a bit convoluted.
Anyway, when the mix port and the transfer uppers crack seem to matter most. Is yours opening mix 7degrees before the spigot ports or the piston windows? If you have been going off the spigot ports you may have several more degrees of separation.