Some mod packs make resource gathering a slower and that is one thing Hammerz is really supposed to help with to a point. That being said, by the time I have enough materials to make one of your hammers in some packs, it isn't worth spending them on the hammer instead of other things in the pack because 27 ingots for one tool is a bit much; especially when you consider a full set of armor for the same material is only 24 ingots.

I realize Tinkers hammers cost 24 (8 each for the three head pieces) assuming you don't use metal for the handle parts as well, but they also inherently include an ore doubling mechanic that you don't and are compatible with CraftTweaker/MineTweaker.

Perhaps if there were an alternate recipe for them (disabled by default) which used:
ingot, ingot, ingot
ingot, stick, ingot
null, stick, null

I actually tried to use CraftTweaker/MineTweaker to edit your recipes myself for a pack and use:
plate, ingot, plate
null, stick, null
null, stick, null

Since early game plates in the pack are four ingots each (two for planks/stone), that would work out to one block early game and then get reduced later on (progression).

But the way they are coded isn't conducive to that process because the only difference between each hammer is an NBT tag. It would be much easier if they had a meta data assigned to each one as well.

Not to mention any item piping mod that uses filters would only be able to differentiate your hammers by NBT also, which might go unnoticed at first; causing some systems to clog or incorrectly route hammers.