Lowering usually improves aero unless you have a very smooth belly and some wheel fairings.
I would install spring compressors as they are reversible and cheap and don't change the spring rate as much. If you do heat the springs do it on the tighter end of the coils which is the softer end. You don't want to lose the stiffer part of the spring.
I think rake should be nose down, but just one or two degrees. Your friend would probably have gained even more from a flatter rake. Make sure you put in some ballast in the drivers seat when you are setting the rake.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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