Steemd config.ini settings to reduce memory usage of full node

I'm running a full node for my voting application and it's using a truly hideous amount of memory. Can this be reduced?

I have the full node only so I can look up account history (curation rewards, transfers, etc) for a handful of accounts. There are two lines in config.ini that I'm particularly interested in:

track-account-range =

and

account-stats-tracked-account = []

What do those do, how do they work, has anybody changed them from their default settings? They feel like they're the solution to my problem.