Arrrrrrrrgh I was hoping today would give me a clue!
I put the original cam sensors back on, no hard hot starts now, so yep off they go for a refund.
I did a smoke leak test, the can of smoke didn't work for me as it shoots out very cold if it's going into a hose. If you have a big opening to spray it into first before pressurising it, then it'll work.
I just did it the same way the guys did in the above video.
The smoke only came out of the intake.
Next I tried my coil pack spark tester, tonight I'll upload a video of them so you can see what it does.
They all seemed to be the same, slightly pink/blue spark.
Next I tried a new maf, and no change yet although I haven't driven properly yet.
I'll chat to Jez at Horsham Developments on Monday.
Just to clarify, no lack of power or hesitation.