I just can't help but think of what happens when you run out of talent and have a big loose, chasing opposite lock to try and catch the big slide through the dipper at OP...
Possibly a stupid question, but is the point where the LCA meets the castor arm supposed to be unmovable? (maybe I looked at the pic's poorly, but it looks like there is movement there?) I would also have to agree with Duncan, Alignment is very important with all these adjustable parts on board now and a solid check of this, possibly with standard wheels on, might be an idea?
Anyway, just some idea's, hopefully they help.