77 in MP1 vs one EP limper

[Fortitude]

While we are on the topic of limping, raising, or folding after limpers with smallish pocket pairs how do you guys play these in shorthanded tables.

6 handed, UTG or MP limps, you are CO or button with 22-66 (I presume 77+ is auto raise vs most limpers in this spot)

What's your move and why on an unknown table?

I limp after any limper in this spot with 22-44 and raise 55+. I question my play because this is somewhat proportional to raising 77 in MP1 vs an up front limper.