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if the brakes are binding, i’d check the bore of the master cylinders, and bore of the brake calipers – make sure they’re not terribly scored up.
I would also call the manufacturer/distributor for the parts you have, and see what they say to run.
Remember DOT5.1 =/= DOT5.
DOT5.1 and DOT4 are gylcol-based fluids.
DOT5 is Silicone.
What that means is that you usually don’t find rubber seals compatible with both – it’s one or the other.
EDIT: it seems OTK uses DOT5 (silicone-based fluids).
My intrepid with Righetti Ridolfi Master cylinders runs DOT4 or gylcol-based fluids.
If you ran the wrong fluids, you’ll need to replace all the seals in the brake system – both master cylinders, and front and rear calipers.