The fluorescent colors I have are from Golden and I think Spectra are thinner than Createx. As far as coverage, make sure you are mixing the fluorescent colors really good before use. Chartreuse and pink are infamous for pigment settling/hard packing. Once throughly mixed build up the color with layers. Spay, heat set, spray again until you get what you’re after.
As for painting over holo tape, yes you can. Just go lightly over it. Test out a few blanks with varying amounts of paint and clear coat. This way you can get a feel for how much paint you need. I would also suggest consider spraying alcohol ink over the tape. Very little is needed and it gives the bait a nice look. See attached photo.