Multiples all Paxel durabilites using this formula:
t*3 = durability (t being the tool a paxel is made from)
The Steel Paxel uses (t*3)+50 = durability instead, since you need 2 Iron Ingots to craft it instead of 2 Sticks
Requires Mekanism: Tools and CraftTweaker
Should work on any version that has Mekanism. If not, please let me know.
I figured since you need 3 tools to make a Paxel, I figure it should have more durability than the tools you make them from.