Great, glad to hear this! Well the more you turn it, the more power the stick pulls. It's not really an issue of overloading the GekkoScience hub's maximum power rating, instead it's mostly a cooling issue. You could definitely mount some tiny water blocks to the sticks, after removing the stock heatsinks, and hook up a watercooling loop. Then they should run at even higher power and clock speeds.
People have literally had components fall off the PCBs by not having adequate cooling, therefore I'm emphasizing to be super careful and only increase the core voltage by however much is needed to just hit the target speed and not overdo it.

If you're confident in your cooling setup, feel free to further increase frequency, until it gets unstable, then adjust core voltage again to get it stable. But it's all out of warranty I'm sure, since we're overclocking them obviously.