A freeway flyer has nothing to do with the things you listed, they use a 3.88 R&P to give numerically lower gearing, that's what makes a tranny a freeway flyer. Those other things are good though!
You should ask them about the SAE correction factor, they should know what that is. What was the weather like that day?
If you are interested in getting more power out of it, take it somewhere with a wideband O2 sensor, its the only way to know for sure. Set it up at 12.5:1 on the main jet circuit. You are probably still richer than needed and therefore giving up power. You'd be surprised at how much power about .5 difference in AFR can make. You can set the idle circuit quite a bit leaner for better millage. I run mine right around stoichiometric on the idle circuit and get around 20 mph, but on the high end make 230+ hp around 12.5:1
Your CR is okay, a little on the low side, but not terrible. On your exhaust, are you running J-Pipes, or heater boxes. If heater boxes, ditch them in favor of J-pipes and you will immediately gain some power. Or you can get the large tube heater boxes if you "have to" have a heater. I didn't have a heater in mine when I lived in Houston, that's what jackets are for
While you're at it, put on 1.25:1 rockers and get some more power.
Verify whether you have (single) HD springs, and if you do dyno it to 6k rpm next time, don't be skeerd
Your motor is a nice little combo and something is holding it back. I believe it should be capable of 100+ hp with some more tuning. Rockers, J-Tubes (if you don't already have them), and a proper AFR. Also set your max timing somewhere around 30-31 deg max and make sure you have a nice strong spark on all 4. Don't cheap out on the plug wires or buy fancy colored ones (like EMPI), use real Bosch parts in your ignition.