Making Perception Checks Less Random

[Captain Joy]

I don't like the excessive ranges in the margin of success you get in GURPS when you make a perception check using the usual 3d6-roll-under-target-value. I think from now on I'm going to have my players roll two Fate dice and add the result to 10. This will give results of: 8,9,9,10,10,10,11,11,12.

This way, having a +1 or +2 better perception than somebody else actually means something. Should I make Perception and Acute Senses more expensive because of this?

Any other unforeseen consequences I should be aware of?

I thought about a mechanic like rolling a d6 or d4 and adding the result to 10, but the two Fate dice give a nice distribution.