Hows everyone doing?

First post here on the forum, and was hoping to gain some insight on what's going on my rev up coupe (2005 6MT) From a glance the car definitely has an exhaust leak at the manifold or near it. It starts with no hesitation and idles fine between 650-750 rpms, however when going under load any gear, throttle position, and RPM range the car falls flat on its face (extremely sluggish to get up to speed). And also has misfire p0300 running nearly immediately under load. Things I've addressed to try and correct this issue: ran a compression test ( kind of on the lower side averaging between 150s and 160s, none below minimum though and none with a 15psi difference), changed spark plugs to OEM NGK plugs ( verified gap at .044) and changed valve covers ( heard hissing from the pcv valve and oil leaking from covers so two birds with one stone on that one) also the coil packs are definitely getting replaced ( mismatched between OEM and Amazon brand SMH) have a new OEM set on the way. In addition I've had some strange data readings from the B1 S1 and B2 S1 when driving and at idle their readings are drastically different, ( at WOT at around 3k rpms I'm seeing short term fuel trim on bank 1 at 25% and bank 2 is at -19.5%) of course it's misfiring with this happening. I feel like this is a huge reason my car is acting up, would you guys have any suggestions? Thanks for any input of course.

 

Update**

Ran the STFT data at idle and am coming up with 25% added on Bank 1 (Passenger Side) and varying between 5 and 9% on Bank 2 ( Driver Side). Long term fuel trim on both banks are at 99.2%. Of course it gets much worse under driving conditions for Short Term Trims, I'm thinking maybe clogged cat? Again any input or opinions would definitely be helpful. I'm a bit stumped.