2.76 open to 3.55 Sure Grip...expectations too high?

To combine and summarize;
compression ............... LD@90psi
1 - 130, 133.................10/12CC
2 - 135, 134 ................ 6/6 CC
3 - 131, 129 ................ 3/5 CC
4 - 134, 133 ................ 4/4 CC
5 - 136, 136 ................ 5/6 carb
6 - 140, 139 ............... 4/4 CC
7 - 122, 120 ............... 3/4 carb
8 - 137, 137 ................ 2/3 CC

I'm struggling with #1.
11psi drop with 90psi injected is 79/90=87.8% so 12.2% leakage. But, that hole is right on the average as to pressure. And worse is that you say it is going into the CC. So I don't see that as being possible. I can't explain it except to say that I don't trust the LD number. Unless there is damage in the cylinder, right at the very top.
Number 7 is an anomaly; the top of the bore appears to seal very well, but the compression is low, pointing to a problem further down in the bore, or I might suspect that the test pressure is too high, and it is affecting the readings, by jamming the valves closed
Number 6 is also odd, it has the strongest compression, and about the best LD, so it represents what all the others should be aspiring to. I'm gonna go out on a limb and say that the pressure reading is not accurate. And that 133 to 137 as the others show, would be more correct.
The rest of the numbers are very good, if not exceptionally good

Leakage thru the carb usually means the intake valve is leaking. But in your case, the numbers are so very small, and nothing on the plug is helpful, and 90psi is a lotta test pressure. I typically test at 40psi, unless I'm looking for a particular problem.
I'm assuming that you are testing at TDC Compression on each cylinder. 90psi is kindof dangerous because the actual force on the top of the piston is 90 x the area, in your case 12.25 sq inches, so 1100 pounds of force. When that goes over the top, even just a couple of degrees, you cannot stop it. I pray it doesn't go over backwards.
I'm also assuming that you did NOT inject any oil into the cylinders. For the LD test, that will mess up the numbers, until the pressure blows it into the CC .

I would throw the #1 LD test out as an error. And #6 while peculiar, IMO, it is no big deal. But #7 is the black sheep; it is pointing to a problem on the cylinder wall that sorta goes away at the top. That means either a scratch/groove/rut, or an out of round cylinder.
So right now, you sorta have a 7 cylinder, unless #1 is accurate, then a 6 cylinder, and if 5 and 7 have leaky intake valves........... then that is gonna play havoc with intake until higher in the RPM band maybe 2200 or so.

If it was my engine,
I would redo the LD on #1, and
redo the compression test on 7, and
prove that the 5/7 intake runner is sealed on the valley side.
If it the intake to head interface was leaking, then ALL 8 cylinders should have leaked into the intake as well. But if you failed to remove the PCV and seal the valve covers, for the LD test, then you may just have been blowing pressure up the PCV hose. And besides, if the CC was blowing into the intake, there are at least 3 other cylinders with partially to fully open exhaust valves, so Ima thinking the air would just go out the tailpipe.
I would redo the LD on those two (5 and 7) as well, with the engine sealed, to prove that the intakes are actually leaking.

But before I would do anything, I would fix the leaks in the shop air,lol.
Done