by installed preload I mean you measure the spring. when it's off the shock. Then you install it on the shock and it's 10 mm shorter. So, say the spring is a 7 inches. It should be somewhere around 180-mils tip to tip. Then you use a spring compressor and after it's on the shock, 10 mm static or installed preload — in other words, the spring measured the exact same way should be now 170-mm tip to tip — you should get about 48 to 52 mm of sag from totally extended without any hydraulic preload.
Yeah a 1000 is way off. I looked at the penske numbers and that's a really long way from my experience. I had a 2002. Again, I am 180 and with about 12 mm installed preload (a little much but not too bad) I got exactly 50 mils sag. On my 2018 — slightly different linkage ratio — I have a 625 pound spring with exactly 10 mm static preload and I get exactly 52 mm sag with me on board. The chances of 1000 or even 900 being right for you when you weigh only 45 more pounds than I do are minimal.
And Big — or do you prefer to be called Mr. Head? — remember I am not trying to influence your ride quality, I am just going by numbers that are pretty standard in the in dusty. For instance I may disagree with Dan's assessment with your numbers — I actually know dan a little as I have a Traction cartridge up front and I gave them a little help with v strom compression adjuster — but 10 mils static preload and 40 mm sag is nit that far from what I have mentioned. And a long way from a 1000 pound spring.
Goof luck. PS, spring are pretty universal — and a 7 lunch translates into a 180-mm if the shop is metric, so if penske won't sell you something soft enough, you can source elsewhere.
And One thing I found out is that lea the suspension adjust in the world — my rear shock is a triple clicker as well — won't make a bit off difference if you're not within one spring iteration — + or - 25 pounds — they can't make up for that much of a mismatched spring.
again good luck