Silicone Spray: meh. Didn't notice any real improvement. Not worth it imo.
PTFE Dry Lube Spray: definitely rejuvinated the string bed which was the most worn of the three. It was as good or better than the fresh sb in spin potential. Worth further study. Good news is that it didn't leave marks on the balls or cause them to collect dirt. They looked just fine. In fact, the fresh, uncoated stringbed did far more physical damage fluffing them and ripping fuzz off them.
The PTFE seems to collect in the crevices which may explain why it doesn't leave marks and why it seems to frelin the notches.
2x BLX 6.1 Pro Staff 95: 12 oz., 8 pts. HL, SW 325
VS Touch Black/Focus Hex 1.23 @ 58/54