I didn't look back at your aero setup but obviously you don't want to create lift on the back.
Lift on the back is gonna lift your front wheel.
The (maybe) 4 pounds of your bike battery is not gonna do much.
Maybe you can try to sit further front ?
Those bikes (SR or GN) have a custom style geometry with a rather short wheel to wheel distance making them not very stable to start with, even more so if one drop the fork in the clamp making it a little shorter and a little less stable.
I am planning on swapping my rear swing arm for a longer one just to cure this issue.
Check out my build thread, there is a picture of the bike with a longer swing arm (not too easy to fit thought)
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