Signs of excessive backpressure?

So to add onto the confusion, I was playing with my WGDC and went a bit over the top, it made 24.5-25psi near redline and IDCs were about 110% and not a single hesitation... and it was fast.

If I am being honest, it seems to be a hit or miss kind of thing and I think I am looking in the wrong areas, I don't think it is a tune related issue. I bought this car not running and had been sitting for about 3-4 years so I think it could be maybe a bad ground, wiring or something that is unrelated to the engine.

Do you guys have any ideas of things I could check in terms of wiring / grounding on a MPS 6?

Maybe crankshaft or camshaft position sensor, is there a certain distance the crankshaft sensor is to be from the harmonic balancer cogs?

Edit: Not sure if this matters but I pulled the motor and accessories from a Mazda 3 MPS BK. I assume the parts can be transferred across with no problem?
 
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