i have this wobble also, it doesnt bother my cars. i always do up my shock screws very tight.
i had a run in stock today, one last time , as i have been helping with settings for the SP guys. found a nice consistant setting in the speedy, and i re set the race time record today in blistering heat. track temps up to 61C and 39 C in the shade. the S411 was very consistant to drive, our readouts take 3 lots of consistancy times, first row, all lasp are counted, second row i think is taking off your worst lap, 3rd row is taking of your 2 worst laps. it didnt matter, my consistancy was 0.12, 0.12, and 0.11. there the 3 rows, and new track record set. very happy with the chassis for both Stock and Modified, just very easy cars to drive fast.
i never run stock before, and i think Nationals just gone by, fastest race time i thikn was 20 laps 6:06 . today i did 4 runs Minus that time, and re set the race time at 20 laps 6:02. Awesome cars