Carl.. I,.. too can't move away from oil's. I always use the 'Acrylics', as base paint and intitial shading ! then turn to the oils. However there is an additional bit that you could try in conjunction, with using the 'Index-Card', method!... Once your oils are on the card,.. leave them for 30+ mins, as has been stated from a few guys above!.. and a slight twist on Einions method,...... But then blast a hot hair dryer over your paint for a couple of mins, so pretty much most of the oil has been dried out!... It does seem to give a much flatter finish, when applied.
Then maybe, a quick, very light, over-spray with 'Matt Varnsh', between applications. Saying that! the more oils are over painted, blended, painted, and again blended, more so when the intial coat has dried, Its like 'Polishing', and buffing. Not what you want.
I am tinkering, with another method at the moment!.. Applying the oil as normal, once happy, then hit it with a hair dryer!... Dullcote, secondary Paint, Hair-Dryer, Dullcote! etc Without building up an excess of each.
Mark.