Which social conservatives in history are praised in modern times for their views?

Your premise is problematic because it's an example of presentism — i.e. an anachronistic interpretation of history which relies on modern concepts, values, terminology, etc. Specifically: the definitions of 'conservative' and 'liberal' vary wildly over time; they're heavily contingent on contemporary context.

Here's a pretty good essay by a former president of the American Historical Association on the dangers of presentism:

Presentism, at its worst, encourages a kind of moral complacency and self-congratulation. Interpreting the past in terms of present concerns usually leads us to find ourselves morally superior; the Greeks had slavery, even David Hume was a racist, and European women endorsed imperial ventures. Our forbears constantly fail to measure up to our present-day standards. This is not to say that any of these findings are irrelevant or that we should endorse an entirely relativist point of view.

So, for example: the use of the term 'liberal' in US political parlance as essentially a synonym for 'left-wing' is deeply flawed. That conceptualisation of American liberalism is a very different beast to the classical liberalism of John Locke. The conservatism of Edmund Burke isn't that of the modern American conservative movement.

There's also the problem of identity politics: we talk about 'social liberalism' as a discrete quality, but we're actually talking in general terms about attitudes to many different issues: gender, race, class, sexual orientation. Many of these historical 'social liberal' champions — from Wilberforce to Lincoln to Martin Luther King — may be iconic in their attitudes to one group, and decidedly lacking by modern standards in their views on another. Take George Washington: he fought a war in the name of American liberty, but he was also a major slaveowner.

The point is that making those judgements based on modern standards and concepts is a bad idea, because it tends to distort our view of history, not clarify it.