The tender/helper can be put above or below the main spring.
Upside down of the main spring will not cuz any problem
Upper spring perch and tender spring shouldn't cuz any issue also because once your car sit on the ground they will clam very tight.
Did you check all the bushes?
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E93 335i Alpine White, 19" Works, PSS, M3 arms, M3 bushings,M3 E93 FSB/E92 RSB, powerflex rear diff bush.
AST 5100 with M3 rear camber arms. GC street plates.
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