Re: 27'' tyres
When you get those mounted and have some time to play, try turning the front tires backwards ( switch left to right) and let me know if you get more traction in a turn. My theory on directional treads are that they work fine when they are being powered, as in the rears, but on the front the tread pattern is working against itself. Turn the wheel to one side or the other and look at the deflection the tread is exposing to the ground. I think it works better going in the wrong direction. I tried it with my Afterburns and I could tell the difference.
I might be stirring something up here but there is a reason tractors don't run directional tread on the front. The same with duners.
Just an idea.