You exactly right David.Alot of that has to do with less heat.So Less glaze is what you end up with.When there is less surface area there that also means less mess.lol
It will increase rpm just a tad but will diminish torque.
We used this alot on Paradox's,P2k's and P2k2's.
Being the Monster's and Binary's are such High RPM we didnt do much with these unless it was a 766 on the -.
On Core's/Hellfire's,MVP's and Integy motor's I ususally do a small hole in the + which would be a reedy 767 and a bigger hole in the - side being a 766.
In sedan I run Red's either both sides or sometimes even a purple and red for small to medium and for faster flowing tracks it's red both sides or a Red and Green.
Offroad it's red+,Green- for buggy and sometimes for truck on bigger tracks or in truck red on both sides on smaller tracks.
1/12th scale is a lighter spring.Green on both sides and sometimes a blue even.
In 1/12th scale I have had REALLY good luck with 766's on both sides with hole's drilled.They seem to take 2-3 runs to fully break in and get faster with every run.Being a lighter spring and less stress on the motor I can get 6-8 runs before even skimming the comm with 766's.
Keep the learning coming guys.David is proof of this and is soaking it all up as all of us are.
Goodluck racing guys and have fun.