That's a very generous offer Tatanka. Joe, as far as my memory serves, all regular fuels carried an 87 rating. Pretty sure you wouuld know if you had a stuck lifter but like detdr says, check it out. I'd definitely clean and re-sync the carbs anyway.
I think you should ship your bike out here for a few weeks and let me judge weather a USA pampered 1200 Tatanka has the goods to keep up. You may need a new screen because it can get windy down here. Would have loved to have caught up with you. Maybe sometime in the future. EricI agree with Doc, to which I'll add: Try about 1oz./gallon of SeaFoam in your next tank and see how it's doing about halfway through the tank. No downside, as it cleans carbs/intakes very well.
Have your carbs been synchronized within memory? It made quite a difference on my '85 GL1200. You agree to pay the round-trip postage and I'll send you the 4-carb synchronization gauge set I bought from Trike Lady (who IS Nichola Tesla's great-grandaughter). I only need to use it every 2-3 months, and that's just to make sure my bike is faster AND more efficient than some Hoon with the same bike, an Aussie who visits the US from time to time with his MUCH better half. Rather see it used than just sitting in my shop. This offer applies to anyone who would like to borrow it; it's a good tool (Thanks, Val!) Just pay postage roundtrip, and you can have it for the day/few days that you need it. It's just for us carburated folks.
Enjoy your classic Wing!