^This may sound stupid, but you have tried Ctrl+G for smoothing?
If not, the only other thing I can think of is that you have the segment turning too far. I NEVER make a segment (on a bend) turn more than 90*. I recommend having them no more 60*. If you get your bend almost pump free, then split the segments, then try smoothing. That could work.
As for the lateral spikes, check that the track is heartlined, and the trasition isn't too fast.
If not, the only other thing I can think of is that you have the segment turning too far. I NEVER make a segment (on a bend) turn more than 90*. I recommend having them no more 60*. If you get your bend almost pump free, then split the segments, then try smoothing. That could work.
As for the lateral spikes, check that the track is heartlined, and the trasition isn't too fast.