compression test question

Good cylinder pressure numbers for almost any engine would be 165 to 185, and all pretty even. Too much more than 185, and it gets hard to tune on pumpgas.
Poor numbers are subjective. It is my opinion that 125 and less is poor. It doesnt mean that the engine is junk, just that it is way below it's potential. A single cylinder engine will start on just 30psi, and power up a grain auger all summer running just 80psi. Your lawnmower probably has not got 100 psi.
So, if your slanty happens to be 125, but all the cylinders are more or less even then it will be a runner. Just don't be thinking of hopping it up.
Yours on the other hand...........doesn't look good. I'm surprised that it actually pulls 80mph.
Now as to the test;
The test does not need to be done at WOT if you don't have a starting issue; it can be done with the throttle on the fast idle cam; It just takes more compression cycles to reach it's maximum pressure.Also keep in mind that any cylinder you are testing that is not at WOT will be drawing fuel out of the low-speed circuit. At WOT, there may not be enough "vacuum" to activate any circuits.
The reason I do them at WOT is because I also keep track of how many shots it takes to reach its max pressure, and how much pressure it builds on its first shot, or two.An engine that makes 70% or more of it's peak,will be a good starting engine (assuming the tuner gets on it). An engine that reaches it's max on 5 or 6 cycles will be a good strong runner. If your engine takes 10 or more cycles with the carb at WOT, I don't care how big a number it posts, something is wrong.
As to the method;
the engine needs to be warm, and the valves properly lashed. The starting system needs to be up to snuff,the plugs all out, and the battery fully charged and ready to work hard.The carb needs to be working right so that the cylinders have not been washed of their oil.
With numbers like yours, I would be doing a cylinder leakage test next.