BRCA rules are that you don't trim the shell and lower it. Trim to the lines on the shell is all that is allowed. If you are never going to race a BRCA Regional or National then fine. Having tried this the biggest impact you can make is a lightweight shell - lowering the shell isn't that effective.
The lower-grip set-up in the instructions works for everyone everywhere. Changing tyre hardness is the best change to suit the conditions. If you are really stuck, then front springs are the next change.
It sounds as though there is problem with the build that is giving you issues, but let's see when your set-up comes on to the thread.
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