The reason the 103 HO engine has more compression than the earlier 103 engine is that HD used a different cam. The cam will change the compression ratio more than a head gasket will.
The increase of compression with a .030 head gasket isn't worth it IMO why tear down the heads and do all that work for such little gain in performance. Now if you had to tear down the top end to do a R&R or you were putting in a big bore kit then it makes sense to use the .030 head gasket. JMO
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.