I personally have been using G.Skill Snipers. Easily overclocks and runs quick. Im also using close to what you are.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231460That's what I run overclocked from 1866 to 2133MHz with a 10-11-10-28 timing. I Purchased those however back when no games took advantage of 2133Mhz and was $66.99 for 8GB.
If you google online you'll find very few games actually take advantage of higher memory. Battlefield 4 being one of those games that do.
Most however is fine at 1600MHz. Don't drop to anything less then 1600Mhz. Sense your editing 1866 or above would most likely help make things faster as a whole.
Your i7 4790K should run the memory fine without having to overclock. Most CPU's support higher memory especially so when you're using a 4th generation.
I know my i5 760 1st gen Quad Core i5 required me to overclock my CPU in order to take advantage of the speed. My i5 4690K doesn't as long as it came with that rated speed in the first place.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231627^_ 16GB (8GB x2) 1866Mhz
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Intel Core i9 Coffee lake 9900K @ 5.1GHz
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