Depends on the size of your piston holes buddy . My PBS took that light weight because the piston holes were small... my kyosho MP777 is 45-35 right now and they are still a tiny but softer then my PBS suspension was. My friends hyper 7 TQ kit had 50-40 in it and you'd think he had 100 weight because of the small piston holes and it made the buggy drive like it had a ridged fame.

Edit: No matter what you put in there you will change it sooner or later as the track changes from month to month (unless its perfectly groomed) and you'll probably change it after the first day you try 35-30 because it might not feel right for you. Remember on bumpy tracks you need lighter oils to take the bumps better and give a smooth ride... if you had a heavy oil you will bounce a lot and loose control. For very smooth tracks you can get away with a heavier weight oil which will make the buggy feel more stable and consistant in the corners while a light oil will make it feel kinda sloppy.