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I'm still stock (155) and lovin' it so I don't have answers to your questions.
I will say that to me push on the front (skis not grabbing, front transfer) and no rear transfer both point to the RTS spring on the Holz type skid. You could stiffen the front springs but I wouldn't like to go that way with this light package and doesn't help the rear transfer.
Did you give any time to the stock springs? If you have a progressive RTS spring cranked up to get ride hieght and front transfer you may be too stiff on the finish to allow any travel of the rear sissor. It would feel stiff and flat.
This would leave you riding primarily in the middle few inches of rear sissor travel and sounds like what you are saying.
I can see using a dual rate spring on the FTS because that is how Holz designed it many years ago but the rear sissor has to stroke through it,s travel for the sled to feel lively.
Just thoughts not answers.
good thoughts. I may go back to the stock spring for the RTS for just this reason.