Just this week tried my TP II with a double setup and it was solid could not tell the difference from when diving single and pony prehaps even better balance and trim.The doubles were banded and manifolded which makes it much more stable to start with than a pair of independants. The tanks were twin steel 7ltr's which are small but now i would not hesitate to try my steel twin 10's with the same setup.I have not dived with the OMS so i can not comment ,but it is also a popular kit here in UK.
Regards,
MAL
Regards,
MAL