There is a good chance that if the clutching works good at 1000' it will not work well at 6000'. This is because the engine will be down on HP because of the light air. May need to tighten your spring, less weight and or less helix to work at high alt.
No clutching will work the same at 1000 vs 6000ft period. Performance gain may be even less as compared to gain at 1000ft. This is because the clutch kit is more aggressive and at 6000ft you do not want to be sacraficing backshift which you may get away with at sea level and the better air.
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