I recently downloaded eehack and was playing around with the cylinder disable feature and cylinder strength test. When I manually disable cylinders 1-4, the result is very noticeable. 5-6 not do much so and 7-8 almost undetectable. When I run the cylinder strength test, it shows 1-4 in the mid to low 40s for cylinder strength and 5-8 in the upper 50s, low 60s. I have two questions based on this.

Should I be looking for a mechanical problem with these results?

My logic tells me that the cylinders that yield the least change in engine operation would be the weakest cylinders, why is the result opposite of that?

The car is a 383 lt4 with Afr heads long tube headers and a cam with about 232 duration at 0.050 lift. I'm only seeing 65-70 kpa at idle, so are my results normal? The car does not feel like its weak or has a mechanical issue.

Thanks in advance for any help.