There are several things that you can look at, but it looks that you're plate isn't staying wet enough. Maybe it's as simple as opening the nip on the Kompac unit to allow more water in the system. If that's not an option, if your stripes are set correctly, maybe altering your fountain solution could help. I'm not familiar with Formula 300, but our solutions that we use are all 2 part. The fountain concentrate and the additive (alcohol sub). If everything was set correctly, I would consider upping the substitute in our mix to see if I could get our water wetter.
Other things to look at:
Make sure there is no end play with the form rollers so they aren't oscillating on the plate.
If you haven't done so, your ink forms to oscillator stripes s/b the same or slightly bigger than the stripes to the plate. You don't want the plate to drive the rollers. We set ours at 4mm. We typically set our forms to the plate like this... Red - 1 to 2 mm, White - 2 mm, Blue - 3mm, Yellow - 3mm and the water around 4mm. Sometimes we'll just set the water form to the point of starting to feel the bump when the cylinder gap comes around on the stripe adjustment. Ours will usually have a slight bump or bounce.
I imagine you've looked at all of these things already, but thought I'd put it out there just incase. Hopefully, some others will have some ideas to get you back on track. You're right, GTOs are work horses and the Kompac units are generally pretty friendly to use... it would be nice if they had speed control, but then I guess they wouldn't be so simple.
