If you lower the boost to make the same HP as you do up high, using same fuel ratios, the clutching shouldnt matter. Making xxxHP at either elevation requires same clutching.
I admit that may be difficult to get the EXACT same HP with Silbers spring setups. But if its just for a weekend, as long as its close still should be more than ample power, as far as clutching.
Do you use a boost gauge? Curious how far off the springs vs actual boost numbers are. Ive heard the spring numbers are lower than actual boost. My bud bought a Silber this year after using a BD ST for the last 4 years. He is going to put a boost controller on the Silber to fine tune the boost he wants.
His BD he set his clutch setup once and hasnt changed it between all elevations. But god awful expensive.