Looking at the data, which contains something new: oscillations; and something unfortunate: bad TDC ID's; and even some ordinary hits.
The TDC ID's are 11-20, rather than 0,2,4,6,8,10,12,14,20,22.
One of the TDCs seems to have a 12nsec oscillation. This is visible in the data and on a scope. The rest of the 20 or so seem to have oscillations with harmonics of 85nsec. We've seen these on the scope also, but haven't traced them down yet. One clue is that most of the oscillations appear in pairs of jumpered cells.
The shift from 6 to 3 volts for the pre-amp power has markedly reduced the crosstalk rate.