Well, you certainly did it the right way with back to back to back comparisons over some weeks. Glad you found what worked best for you.
You've convinced me to try inverted someone, just have to take the time to unwrap one side to be able to do it.
I figure I'll try the no grip route also and see how that compares too.

Very interesting to see a modern GT in that they kept that GT frame tradition thatg under the seat and connects to the top tube.