I weigh @ 208lb 12 oz.
My 129 is set up as follows
Front springs----zero preload
center spring----zero preload---I tried the heavy center spring everyone talks about. I felt it ruined the ride of the rear skid and took it out.
strap ------JUST tight as it sits on the flat floor, which is up 2 from where it was delivered.
rear springs on #1
cat ski with 6 inch dooly's, just ordered 6inch snipers.
This thing steers super light, lighter than any sled I ride with( 2020 t Cats, zr 9000 850 Polaris 129 and 137 and 1 900t.)
not only is it light, it goes exactly where you point it. absolutely NO darting. I can drive this thing one handed at 80 mph with no worries. rails high speed corners.
ski will lift maybe 6inchs on flat ground, hard throttle , hard pack.
no hard bottoming.
The 2020 Thundercats are set up very similar, but they cant get the light steering I do at speeds below 30 mph, but they will NOT lift that inside ski, mine will a couple of times a day.
That and those QS3 shocks make for a really smooth ride.
I do feel light my 129 does turn quicker in the tight stuff than the 137, but the 137 does bite harder