Revell and italeri aqua paints

Hello everyone 

i have been using revell and italleri acrylic paints,and i have a few questions. (I am using sparmax DH-115 airbrush, sparmax ac-100 compressor tankless 16 lpm)

1- is the quality comparable to vallejo and tamiya paints? will i notice a slight improvement if i switch to vallejo or tamiya? 

2- for italleri i use italleri thinner to thin the paint but revell "aqua color mix" reacts with revell paint, it simply doesnt work! why is it happening?

3- when i want to do preshading, my airbrusg clogs every few minutes and makes a lot of trouble, is it because of the paint? the airbrush? or the compressor? 

thanks in advance.