I 4-linked the front today. Again I used the Axial truss, but this time I was able to use the plastic links that were on the same parts tree as the truss (AX80043). With both the front and rear now 4-linked the suspension is greatly improved (the stock Y-type 3-link setup was definitely restricting travel and articulation)
I also made a new draglink. With the CMS kit I used the draglink angle is pretty steep and seems to bind up the steering. Adding some spacers helped a little, but I think this new draglink will help even more. I used the bent rodends and spacers left over from the stock upper suspension linkages. It should allow the draglink to be angled further upward and rearward without binding (see pic: old link top, new bent link bottom). Tomorrow I'm going to the LHS to get a new servo horn, then I can test it out. Eventually I will replace the 2 spacers with a real single piece link, but for now to test it out they should work fine.