What a depressing day. Got everything assembled again and spent a couple of hours getting the preload exact on all four corners with the new springs.
I still have the issue.
The new springs have reduced it a little bit, but it's still hard. When I first pushed down on the rear after setting everything up and it barely compressed, my heart sank. Still not even close to being as soft as stock (and stock is too hard IMO, designed for carrying farm equipment etc).
I figured I'd try to narrow it down by ruling out everything else piece by piece. I went over all tyre pressures, 2.3 psi at the rear both sides. Preload is set millimetre perfect on both sides, and the ride height also matches on the left and right rear frame bolts. I've just replaced all suspension bushings, seals, shafts etc when I replaced the shocks, and that's all still perfect with no play or binding. Low speed compression was set on full plush all round.
Here's where it gets interesting. I dropped an anti-roll bar link to see if both sides compress the same (because you can't tell with the link connected, it's designed not to dip one side to prevent body roll). The rear left shock is nice and soft, like the fronts. The rear right is a lot stiffer. A lot. Like the shock is not valved properly or over pressurised or something. I was going to make another video but it started getting dark and I was already in an FML mood so I just walked away
Not sure what I'm going to do about it yet. I'm going to ride it first and see what it's like, but I can't say I'm super keen on having uneven suspension. I'm not doing NASCAR for **** sake.
I'm pleased that Elka sent the new springs and all, good customer service etc, but these shocks are supposed to be the best aren't they? It's like they valved one with oil, and one with sand. Premium, $2000 sand.