NFA flag is for NFA compliant brokers only, MT5 is normally not used by NFA brokers.

MT5 will never stop a Zorro trade unless you have either intentionally set it, or something was wrong with the stop value, like too close or at the wrong side of the price. Then you can indeed get the effect that Zorro and MT5 close the same trade at same time. It is not harmful but produces a warning. Read the manual about stop and tp and how they work.

If you tried Zorro in the past and were unsuccessful, I dont think that you will have more success today unless you find out what failed the first time. If you think it was a bug, just check out the bug list, all Zorro bugs are there.

The other problem was not understandable to me, maybe you should explain in detail what you want to do and in which way it did not work. I suppose you confused bars and ticks.