I have experimented with up to 10% time compressing, which adds some jump but I lose some crispness on the lead notes and the drum strikes. The vocals seem to hold up okay. Rerecording is always an option but is not what I am going for at this time. Thanks for the 2 cents.
I am going to try to add more points to the FFT filter and see if splitting the waveform into smaller slices will reduce the "drop out" (for lack of a better definition) sounds from the note crispness. If I understand the compression method correctly this might help. So far I have only working with the same time compression routine for each track, some tracks hold up better than others.
If the FFT experiment doesn't work I will try reducing the percentage for each track until I find a happy medium. This is very labor intensive but not as much as rerecording. (15 songs, many with 20 tracks each)
In my old age and dotage I tend to record things slow, but the youth of today always wants everything up-tempo, at least the ones in my listening circle. I'm not looking to create a racing tempo, just to add a slight increase.