The timing in omniGRID feels sloppyUpdated 6 days ago

Set Shuffle to 0%, or to the Accurate profile. Set the track shift, the master shift, and every per-step shift to 0 ms.

Then check the instrument that receives the notes. If it quantizes incoming MIDI, the grid and the sound will not match.

In Cubase, also turn off "Suspend VST3 plugin processing when no audio signal is received".