1) Fiscal conservatism is much more than tax cuts or even tax policy.
2) There are many conservatives that are fiscal conservatives, but not social conservatives . . . and vice-versa.
3) Yes, social conservatives made a bigger difference this year. However, fiscal conservatives have been with the Republican Party for much longer and it was successful then too.
The word Conservative requires no modifying adjective because it means both fiscally and socially conservative. What you describe here, as I pointed out before, is a liberaltarian.
The left hijacks enough terms of art as it is, as I see it there's no need for the liberaltarians to do the same.