I would suggest that you get yourself a Sync-Gen II Pro and reroute your MIDI communication. That is FL Studio sets the Master Clock, Sync-Gen generates the clock pulses and sends MIDI Clock to MIDI devices. Perfect sync. No latency.

[http://www.innerclocksystems.com/New%20ICS%20Sync-Gen%20II%20Pro.html](http://www.innerclocksystems.com/New ICS Sync-Gen II Pro.html)