Does seem lean but you have some decent elevation and temps going on. If you worked your way down to it and are happy with the results, the bikes not showing signs of being lean and the plug chops look good then thats that sorted. I generally go for the needle clip position first up as it makes the biggest effect across the widest range of throttle.
Back on topic. Best advice I can offer is to pull the shock out. You can do this by undoing the lower subframe bolts and loosening the top ones and flipping the whole back of the bike up. You'll have to undo the dog bones on the linkage to swing them forward to access lower shock mount. Once you have the shock out mark where the spring is compressed to, and then back the spring off until its no longer compressed. The distance between these marks is your preload (uncompressed spring - compressed spring = preload). It should be around 10/12mm.
While you are at it its a great time to lube the linkage bearings and ensure the swingarm moves freely through its range of travel without binding. You can then either order a new spring, or consider testing the one you have to see what rate it is.
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