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Stonehearth is usually bound by processor and then RAM. The better the processor the better your game experience will be in general with stonehearth, as it is very calculation heavy. RAM will only play a factor when you have less than 4GB and 8GB with very large games.
Looking at your PC specs, I would have thought your games will be bound by your Processor. Mine are and my CPU’s benchmark is higher than yours 
My game always slows down during the 25 - 28 hearthling range, do you have similar issues?
(I have no experience with AMD so the benchmark is all I have to go off)
I would also advise setting all the graphics options to the lowest, in particular lights and shadows as these will exponentially increase the strain on your GPU.
What are the slow downs like, is it just slower in general or is it large spikes of lag?