Engine problem? Options

[Hine62]

Hey guys, just getting ready for the summer, but when I started up the 914 this weekend I noticed that it was running rough. (The engine has dual 34s carbs). I could hardly move the car in first or reverse (not even after warming up.) I did notice the driver’s side head is cooler than the passenger side. Here are the tests I've done:

Pulled plugs while running:
1. no change in engine sound 1 and 2 (drivers side)
2. noticeable change on 3 and 4 (passenger side)

Took a compression test: 120lbs on all cylinders. Of course, plugs did not look normal on the driver’s side, so something is up.

Getting spark on all cylinders.

Removed drivers side carb, found silicone covering hole in the accelerator circuit. Re-adjusted both carbs and linkage. Weird find but runs better.

Now the driver’s side still doesn't change the sound of the engine when pulling the plugs. It's like the cylinders are running better but not contributing as much at idle. The car is able to move better, almost normal now.

Just went out and checked temp on head and the driver’s side is still a lot cooler than the passenger side.

So the big question is what could be going on? Dropped value? Valve adjustment tighter on drivers side? Carb problem still? Replace the plugs? Leaking between head and cylinder? Time to upgrade carbs to dual 40s or 44s?

Any help would be appreciated...