longer shocks, softer springs, 4 links set up, spring pre-load, may make it flex more. I don't like too much flex on scx10. scx10 is still a trail crawler not a rock crawler.
eric I think yours is looking great. I removed my bump stop. mine rub the body a little bit. I did not trim the body but raise it up higer. to 亜邊個 I post a amain link that is a rock crawler most of the time thy use 2.2 wheels only. trail cralwer use both 1.9 and 2.2 . it depends what places you are running it.