EVGA recommends not to exceed 1.35. My XMP (corsair dominator 3000) does hover above that like yours but I set a manual voltage to hover right at 1.34 - 1.35. No issues I’ve been running that for awhile. Not sure of any long term effects of running a higher voltage.

You should be able to monitor RAM temps.  My Micro board has two sensors.  With overclock at 4266MHz at 1.45v, RAM torture loads get up to 39C.  I have a 120mm fan blowing from the side onto the VRM heatsink and the RAM modules.  Overclockers around the net use 1.4v, 1.425v, and 1.45v 24/7.