The shocks are most probably the issue here. There was a post years ago about shocks, angle of mounted shock, shock oil weight, etc. Unfortunately I can't find the post. Basically, with a specific spring rate, the spring will provide the most force when mounted vertically. As the shock is leaned over, the spring force decreases, even with the same spring. Something to do with geometry and physics I believe. As you lean the shock over, you need to use a lighter weight oil. Changing the shock angle allows for some minor shock tuning without having to replace the shock springs to a higher or lower spring rate. Without knowing the spring rate of the springs on these shocks it will be a little bit harder to pick a set of springs that will give you a higher spring rate.
I would say all four (4) shocks have the same issue as you're seeing it on both sides, right and left. As already mentioned, check each shock for damage, but if only one shock had damage (bent shock shaft maybe), I would suspect it wouldn't show up the way you're seeing it now. I'm with JimrC and AnimalHippie suggesting taking the shocks off, checking for oil in the shocks, how does the shock move without the springs, etc. If there is no oil in the shocks, I'm suggesting starting out with a really light shock oil, like 10wt.
Good luck.
