Welcome to the rock mate ... Nice to see you here!
So I am seeing these biplanes got you more hooked then painting WW1figures
... Try an acrylic base, it helps more to speed up oil to dry ... As for varnish go for acrylic ones will be ready in minutes, I prefer Tamiya by airbrush ... Or else paint everything in acrylics
Ps ... Show up what you have done till date I have not seen a 1/72 wood effect so fine till date ... Shows you a great painter