Hi Lee
(I hope this is of use to you and I havn't read you post wrong, Im rushing about thats all, if I have got the wrong end of the stick the just ignore this post)

Just looking at yours it seems like the cam sensor falls on the 7th tooth on some cycles and just aftr 8 teeth on other cylcles (maybe my eyes)



This capture is off of a 2001 Astre Z18XE, one of the lads that work here and has no faults to my knowledge.



I will post images of my signal drop out later too.

Cheers
James