07 QSM 11 670HP Turbo Leaking Exhaust

QSM 11 670HP Performance Questions

I have had this boat since 2019 with quite a bit of seat time (400+ hours).  This year has troubled me… See below. 

1. Port engine has been burning more fuel (as much as 2GPH) depending on speed all season.  
2. Overall GPH has increased as the season went on…
   1. Which is typical; bottom growth, higher ambient temperatures, humidity, etc.
3. Aug 1st – Cleaned the bottom and running gear. Prop shop checked the props and said a couple blades were bent over slightly. They thought the yard may have done it by blocking the blades during install in Feb. 
   1. They corrected the Port Prop but not much of a difference noticed in Load and GPH on Port Motor. 
   2. Overall GPH came back down and could reach redline but Port Motor still burning more fuel than starboard.
4. Boat sat for a few weeks (most of August) without use.
5. Took two longer trips and slow cruised for both with blow out runs at the end of each. Couldn’t reach redline RPM (2350 rpm Redline I was maxing out around 2150-2200) for both runs. Boat felt sluggish.
6. Thought I may have growth so have tried to make a couple high speed runs but still cannot reach Redline and still burning more fuel than I should.
   1. Back to back trips now I blew the dipstick out and sprayed a small amount of oil. First time it was the Starboard motor, second time was the Port Motor.  Thought maybe the dipstick was not tightened on the first one so I doubled checked both of them but it still did it on the other motor. Just Ironic???

What the heck is going on? No relation to all of these things or do I have something larger going on… I know I need to pull the boat and check the bottom but cant believe after 3-4 weeks after complete bottom redone that I would have enough growth to make a big difference.  Could dirty Air Filters cause any of this? Both blowby filters do not have the Red Indicators popped up.  Any tips to start narrowing the issue would be appreciated.