I have not checked but I wonder if crank sensor is actually signalled at tdc on this engine. I know that fords were always 90 degrees before?
You have a different timebase on the two patterns 1 sec on one and half a secod on other.
going by amplitude of signal there are 4 reasonably even slow downs 2 on first batch before trigger and 2 after as obviously we only get 2 compressions for one engine turn and one crank trigger.
If trigger is on tdc it is occuring on slow down after fastest cranking speed not just before peak of slowest speed where you would expect tdc to be.
The reason for the ford to be 90 degrees before was to allow plenty of scope to build in the advance.
Others do seem to manage by calculating the next timed point after the one before. Think this makes sense.
no doubt a while before we get answer. I wish I had time to play with these things its only when you get a real stinker of a problem thats been looked at everywhere else you know you can take your time and be able to charge it all out properly