Sorry but I haven't had any of the problems that you mentioned above with my S3305. I can hold a perfectly straight line down any straight away and I've accuratly squeezed through some extremly tight areas to get by some people. Not saying I wouldn't get a digital servo because I'd love to have the torque and speed myself just for the comfort of it but unless you have the money to blow theres no reason what so ever to spend so much on servos. I'd rather use the money to help buy an engine or tires.