The #98s and needle position/type were tailored for the stock exhaust and air induction. You can't expect those settings to be ideal for a different exhaust system. The MAC was originally designed (and I use that term very loosely) to replace the exhaust of the K model.
So, in essence, I would expect an F model to run better with stock induction and MAC exhaust and carb settings closer to the 022A set up.
The F muffler was pretty quiet, far more so than either the MAC or the stock 4 into 4's. The higher exhaust pressures these developed, fed the need for a different needle position/taper and smaller Main jet.
The main needle has 5 clip positions. The 022As have the clip in the 4th from top normally. The lower the clip is on the needle the richer the range of mixtures it provides.
If your plug read was a general read rather than a plug chop at a fixed throttle position, you are reading average conditions on your plugs.
You should also know what numbers are on the Jet needles if you plan on doing further fine tuning.
The overriding question I have is; "what problem are you trying to fix"?
If you are using today's oxygenated gas, I'm, not sure pic #22 is so out of tune at all. In essence, that is what the government and oil industry wants your plugs to look like. They don't care if you machine doesn't have adaptive fuel metering via sensors and computer controlled mixture injection so you will automatically use more fuel.
It also matters at what altitude you generally run the bike. With carburetors, this is a factor in "state-of-tune".
Cheers,
