Visual Clip gain seems so arbitrary, why not Select all and normalize to -3 dBFS? Realistically, if you say had a tracking accident and one of the clips doesn't match an earlier clip within the track, the normalization applied to the track would ensure they are reasonably consistent ...and if that works then you could just select all clips in the track and "Bounce to clip(s)" boom you have a complete stem.
I don't see what the issue is, if you want to see more of the waveform, just make the channel taller.
Also, if you've noticed, cakewalk renders the waveform preview by scanning the entire clip(s) so I don't think that waveform information is just stored arbitrarily in memory and therefore the preview is immutable.