spring retainers are next on my list. I assume you made them yourself?
ACC Toyota did them. I was going to have the springs welded to the axle but Brian came up with a much better solution. They are bolt on and work perfectly. They push the spring down nicely, but also allow the spring to move enough to not get caught on the frame during reseating. The amount of travel I am running causes the spring to fully unseat and relocate to another area (approx. 2" to the passenger side, causing the driver side spring to get hung up on the frame, this was prior to this mod)