The experienced regulator/voicer has filing skills, regulating chops, voicing tricks, and an array of solutions to apply in response to constraints of piano, time, budget, and the vicissitudes of by-eye referencing. Even for them, variables represent challenges and simpler is better. For the rest of us, simpler is way better.

So. My tools or yours, travel and square hammers to vertical, position the action in the piano for best tone, and level strings to hammers in the piano. This needs to be coordinated with settling the wire throughout its lengths to finish with the fit at pitch and the piano in tune.

I feel that what happens at strike is most crucial to the piano's TPR (tone, power, and repetition), and that the best result shares compromises proportionately to favor the hammer crown-to-string impact.