I have a manual transmission Tacoma with the r156f transmission. Seems like a lot of people with this transmission and the previous generation 155f(2005-2015 models) complain about 2nd gear and 3rd gear engagement being best described as notchy. So far I've tried redline mt-90, motul 300v and currently on liquimoly 75w90 gf-4 fluid. Anytime I change the fluid the transmission shifts sooo smooth and beautifully that I don't want to stop driving. After a couple hundred miles, which I'm assuming is once the oil breaks in, that beautifulness disappears and I'm back to the notchy shifts. Any ideas why this happens and is there a way of addressing it?