Changing the secondary spring finally and can’t decide on which one, all the posts I’m finding on the topic are pretty old and haven’t answered my questions exactly and would like some new input.

I have a 700 with 28" mega mayhems, 660 weights, 1.2mm shim. I’m going up to 1.5-1.7mm of shim as I feel I’m not getting enough low end and am too cheap to go the machined route since I don’t ride fast anymore and don’t need the top speed.

Should I go purple, gold, or white spring? I do mostly mud and crawling and rarely get above 30mph anymore.

Any help is appreciated.
Thanks, Cody