You can be fiscally conservative and socially neutral maybe or socially laissez faire but not socially progressive or socially liberal.
If you want social liberalism, money has to be spent on programs that enable social progress or has to be spent on enforcement of socially liberal laws and regulations, (history has shown it won't happen otherwise). This is the opposite of what we know fiscal conservatism to be in America.
I know this sounds nitpickish, but the closest you can get is to say something like I want liberal policies as cheaply as possible and unfortunately for those who want to claim the middle with that, that's essentially the policy of liberalism and the left. That's what liberals want too...
What socially liberal, fiscally conservative generally means is I don't care what you do but I don't wanna pay for it and that's not the middle, that's libertarian.
Sorry for the rant but I'm generally tired of seeing a claim for the middle being used as a substitute for I want socially liberal policies but I don't want to feel bad about not fully supporting them because I don't wanna give up any money...
This probably isn't you of course, but it sure is a lot of people who claim to be "socially liberal, fiscally conservative"