Never had any trouble with Tamiya paints before, but try a differant thinner next ime?
I use Tamiya laquer thinner (with the yellow cap), this makes the gloss coat a little smoother and it helps with a better grip on the paint layer underneath.
Gunze (Mr.hobby) has a gloss coat that also works very well with that thinner and I have great results with that also.
Ventilate well when using lacquer thinner!!!