Craig,
A 1.50 seems a little high for the GGP, Did you chose not to run 6th gear? We ended up between a 1.75 & 1.85 @ Greeley. You more than likely want to run a little higher gear at Bandimere.
The same applies to your post for information on gearing at Greeley. It’s a trial and error. Have someone watch you when your on track and note where the fastest racers are shifting compared to you, this might help you chose.
Jon P.M. me on Tag gearing baseline for Rotax.
Rick