I have seen most run a harder front then the rear and your pressures still sounds high try 32 31 and see what you think. 40's are too high for sure and your numbers sound high as well.

Canyon carving here in so cal at 31 30, the grip and wear are awesome!

 

when the rear is at 33 or lower it feels like the tire is sliding out from under the bike.

 

Feeling like its sliding or is it slidding. Lower pressure gives you a bigger contact patch.
Do you think its faster throught the corner at the higher or lower PSI?

 

At the lower PSI it feels like its sliding. Im pretty sure it isn't but it feels like it is. I guess its also mental with the higer psi I have more confadence in the bike. I droped it down to 37 psi yesterday for my ride and it felt good.

 

bottom line is if it feels good to you then go with it.

Ride yesterday, its been soooooooo loooooooong for me [&o]