You do realize that you’ve already gone past the official vdd2 range and that going any higher would have a higher risk of your RAM to malfunction and get diminishing returns in terms of power consumption? Raising voltages is not the primary variable to improving performance—proper timings are. As meha mentioned before, the timing adjustments in oc suite are not proper yet. Until that is done, you can improve performance further without the need of raising voltages a lot.
For instance, in L4T my RAM can run up to 2500MHz stable without any voltage adjustments.