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I'm at work and can't watch the videos, but I've got some thoughts...
If you have a smoke test, great! If not, an old trick that I've used for finding boost leaks and/or vacuum leaks is to (with the car running) spray some Brake Cleaner around all the intercooler couplings and points of connection (anywhere it might be able to leak from). If the engine responds (due to the flammable aerosol being introduced into the air mixture) then you've found your leak. Quick and easy test to help narrow down your issue.
Do you have a boost gauge? What does the boost gauge read under full load when breaking up/lagging? Your engine should boost around 7-10 psi stock (depending on the quality of your gauge, mechanical vs. electric, etc).
Regarding fuel, I've been through quite a few fuel pumps in my day. They will usually whine really loud when they are on the way out. Do you have a walbro 255lph in there already? If not and you have another brand, some of the cheaper alternatives come with plastic gears that fail.
I'll watch the videos when I get home and let you know what I think.
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P.A.T.T.
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