I got my remake board out, and had to remove the video DAC and tidy it up a bit...
Basically I tried the STE booster in there... But long story short, it didn't work.. Which I'm not really surprised about. I never have managed to get the STFM past about 24MHz... Though in the mix of it all, the SEC booster does operate fine at 50MHz, but it is a lot more "mature" booster design.
Going to start making preparations of building up the new SEC boards now for people to test out...

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(Forgot to take a picture of the STE booster installed)