Hello, Dave. First of all, I wouldn't panic - as the nature of the teflon dielectric is that it needs some time to settle-in. The exact mechanism that causes this with teflon dielectrics is unknown, but is well documented with Teflon insulated (or more properly referred to as Fluropolymers like FEP, PFA, PTFE etc...) cables/wire, also.
Things should settle down near the 60-100 hour mark, and then will continually improve from there. This improvement isn't linear however, and there may be a 'two steps forward, one step back' progression as you move through the process. Full break-in is achieved at 400-500 hours. It's worth the wait, and many customers have noted they ENJOY this journey through burn-in.
IF this issue persists at the 400-500 hour mark, I would encourage you to revisit your speaker positioning (toe-in / rake angle). I recently had a V-Cap customer note a similar experience, and it was determined that his original speaker positioning was overcompensating for the dullness of the previous oil caps in his amps. Once the speakers were dialed in for the 'new' balance, he was floored at the improvement.
Good luck, and please shoot an update to the group, once you've moved closer to the 400-500 hour mark, and have re-tweaked your speakers.
