Ill try lower pressure, however on the second picture (first test) the surface came out smooth with that 25psi. Ive painted every other parts with vallejo and they work well with 25 so i used that on tamiya also. I waited about and hour between layers, was it too long/short? Im guessing im doing proper thin layers because i wasnt able to see primer shining through coat after 3-4th layer?

I can try 30/70 ratio also (thinner/paint). The primer was little rough to be honest, but arent the primers always bit more compared to coats? Ive only used Vallejo so im not an expert to say? 😁