Hi mc_deli,
Have you tried V3.5 for both PF and MF? You'll be able to install them with EUU. I did some work to improve MIDI CLK sync performance in this new version. This was included in the beta we released a little over a month ago, and so far we're getting positive responses from the users concerning the new MIDICLK performance. Just last week we released V3.5 to full release version.
With the new improvements, you should try it with the CLK FLT option ON.
Also, if there is any way to adjust the resolution of MIDICLK in your DAWs, you should set them to the smallest possible clock interval to minimize any jitter. I find 1 ms and below works well on the factors especially with the aforementioned new work for MIDICLK sync.
