Know of any series that are like Across or To Be a Better Man?  I feel like these two stand out in terms of modern day dramas, and I can't seem to find anything even close to them.

If you already watched To Be a Better Man I'm not surprised that you've been struggling to find a Chinese modern drama as good as this one. Since I completed it I can't seem to find a drama as interesting and inspiring but I'd like to recommend you Evil Minds if you haven't tried it, it's nothing similar to TBABM but it's quite gripping and intriguing.
I can also recommend you Fifteen Years Waiting for Migratory Birds but it's a school drama, nonetheless really well made and full of nostalgia.
And maybe if you like Medical dramas you can try Surgeons, it's a nice watch but not exceptional (only my opinion though).

But wow TBaBM is a real gem, so happy seeing it's slowly getting the recognition it deserves ♥♥♥