I fine tuned mine and they work perfectly...
I assume you added a bit of forward lean, did you re-tighten the cable after? I do check regularly for loose screws, especially on the highback angle, that may fix the lateral play? SUre the weight might be an issue too..
They do require more tuning (wich I like) but stepping in and riding away in 5 seconds is priceless to me...I have them exactly tuned by now...hlafway in my season.
2015/16 -17- Kirkwood days
Arbor A-Frame 158 2009-10
Jeremy Jones Hovercraft 156, 2011/12
Subaru WRX 06 - 181K