where can i find low profile ram?

Are you using the full speed rating of it? I have higher profile 2000mhz ram, had to keep a fan off of the heatsink to make room but it does fit. Most of the faster ram that i've seen is limited to being higher profile so you may have to find a special cooler(such as a Noctua NH-C14) to accomodate.
 
Going from 16GB of DDR3-1600 to 16GB of DDR3-1833 (or even higher) memory is not going to make a difference. As others have said, overclock the memory yourself.
 
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