That's cool, good to hear your a happy chappy.
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It's been a while.
I took the arm off, and realised it is slightly adjustable. One of the mounting holes are not completely round, but allow a bit of adjustment. I made the hole longer, making it more adjustable. This way, I was able to tighten the spring more, and got more brake power to the rear. Braking felt a lot better, but I still want to tighten it a bit more.
After slight modification: Attachment 71136
Original bracket : Attachment 71137