Applying Gordon Pair Principle in practice

[silentbob]

6 players remaining in a 17-person home game tournament and Hero has $65 in chips. Leader has $90, and the other four have between $50 and $75 each. Mix of loose and tight villains. Top four pays 50-25-15-10 percent. Blinds just increased to $5/$10.

Hero is UTG with 55. Gordon Pair Principle estimates a 5*9/2 or 22.5 percent chance of domination by a higher PP. Push, limp, or fold?

(and what is the equity calculation, applying the GPP, that leads to the "correct" decision given the payouts?)