Hey Rob,
The fuel flux is pretty normal at cam shift. Every flash I've seen and just about all my tunes have an AFR spike/valley at the cam switch. With a bit of tinkering you could get that transition ironed out. At that amplitude, the cam shift should be very smooth and seamless. Long and short of it, is that a small spike in the AFR like the one you have there is OK and to fine tune it more is just for sport, IMO
... I attached a pic of a few AFRs. You can see the spike/dips in the two Katana tunes, which are very well ironed out and then you can see a dip from one of my maps with the old MP62 boat anchor blower
... You can see how my dip/spike was bigger than Charlie's, but it was still a seamless transition despite the AFR amplitude...
Believe me, when creating the initial map, the dip/spike was massive and the cam transition was garbled until I got the map built. Once O got the dip down to a point or so, the cam change cleans up and then I move on to other things. Anymore I switch stuff on the car frequently enough that I'll have to redo the thing (map) before long so I don't get too caught up on that last 5% of the tune...
The comment I'm struggling slightly with is the bit about RPM cut-off? Which one are you referring to? If you're talking about the rev limiter cut off, it's good practice to make your spark limiter somewhere between 8,000 and 8,500 and fuel cut 100rpms above that. You'll end up "bouncing" off your spark limiter that way unless you just rev the tar out of it in first or mis-shift, you may hit the fuel cut as well... Since you're putting down some good power now, and running a stockish head, I'd recommend dropping your spark limiter down to 8-8100 or so. The M62 tends to hit peak torque around 7200 anyway, so you may as well start shifting sooner or you could end up eating your valves like I and several others have done from being way to rev happy...
Best,
Phil