If you are constantly raising OTB then you should continue to do so with your big hands, if you limp a lot then you can get away with limping I guess.

I like to limp the button a lot in HU sng's. I'll do it with big pairs, small connectors, and actually a lot of Axo hands, especially against loose 3bettors. I just feel my edge is so great postflop that I want to have as much money left behind when I'm playing postflop, plus when you're like 30bb deep or less you really don't need the help of a PFR to get the money in over 3 streets.