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Both tests appear to be an improvement. Did you read the troubleshooting blog? It will help you understand how the system works. You still arent running up to about 1850psi and the drop in the second test is weird. You are on the right track, but the HPFP service could be next on your list...

Try an "OEM" PRV. One thing to remember, HPFP pressure is not directly related to engine RPM. You can't diagnose much based on RPM with this design. Provided you got a proper PRV test, yours could be faulty. Something else to consider as well would be a rebuild for the HPFP if you dont know...

Based on those numbers your PRV could be bad or you didnt get a good test. 800's is really low. Not sure if 5 min of idle is good enough to get good and hot.

You did a relief valve test and your pressure maxed at 883psi? And the engine was hot?

To start, perhaps you might try a PRV test like <<this>> ...to verify the PRV is maintaining fuel pressure in the fuel rail, plus it cost nothing. The key is to do it while the engine is good and hot.

What CAI are you running?

The pressure will build and drop based many variables all calculated by the pcm based on injector duty cycle, pressure, cylinder conditions etc. The important part is that the pressure stays high during WOT. However, pressure post HPFP as low as what Forscan was listing was too low. Fill this...

Your images show fuel rail pressure at 49-97psi? Not familiar with the torque setup, but that is confusing. Tank pressure, or post hpfp...?

Replaced 4 coils with OEM or aftermarket? Aftermarket have been known to cause issues even when new.

Easy check is to meter the sensor side of the plug, should read 1.3-1.7 Kohm. If not sensor could be bad, such as open circuit or no resistance.

Anything you do will illuminate the ABS light. If you unplug the possible culprit sensor, the system should shut down. If it still operates you have a wiring problem.

Looks even better in the black. Me likey!

You changed the pump with a known working pump from another vehicle? or did you replace the pump with a new unit? When you replaced the internals, did you disassemble, inspect and clean the spill valve? What tests have you performed? KOEO will show your tank pressure, 50-60psi. How did you...

Worth pinning. Thankyou @L337TurboZ keep them coming. I like the fuse in line with the DMM, never thought of that.

You could try a Ford Intake from the Focus ST. It has a throttle body that points down, not sure if that would interfere with motor mounts in your project tho. edit...Awa beat me to it, lol

If your car runs like garbage with a cookie cutter tune or OEM flash, it's because you have parts on the car that require a tune to run properly. Guarantee Freektune or Will at PD tune can set you up right. My Stratified tune is also running great for years now, but I will be switching to Will...

Hopefully now I am no longer pending ;) Thanks for your help @Raider

Is the tight condition on initial turn in or through the corner? Perhaps if the rear was more in line it would help rotate the car better. Hope it improves for you.

If your car was handling well before, could adding more rear bar cause a loose condition in the rear or did you have room to go still?

Missing your great vids I lived vicariously watching! Hope all is well man.