Reducing power draw of router, minumum draw for basic functions?

Hi, yes would be really helpful if someone with a 750 could turn off the wifi (single click for each wireless) and do a quick test over just the wired ports, the hardware is very similar so I’d expect to be OK but if the GL-AR300M-Ext I already have is right on the limit then those few changes may still be too much.
Hadn’t noticed Glitch had a 750S but yes that has different hardware so possibly uses more power (even though power specs are the same), I would have looked at the 750S as the speedier CPU would certainly be helpful but those non removable antennas have killed that idea, it’s annoying enough with my GL-AR300M-Ext and the antennas unscrewed, definitely not buying something where they are fixed on.
Glitch - if you did get a chance to test with all the wifi off that would still be helpful to know, if the 750S works ok then the 750 certainly should, the updated QCA9563 possibly has same power use as the 750 CPU anyway due to improved newer CPU design offsetting the extra Mhz?

That said my GL-AR300M-Ext whilst great in every way from a form factor perspective is a bit slower than I’d like when using OpenVPN, I don’t really need decent/any encryption so was hoping to get up and running with an L2TP connection. Can’t find much info around setting this up and my question on that here has had no replies at all, if I can’t find a way of getting that setup may be forced to look at alternative products which would be very annoying since this hardware is the perfect combination of small form factor + quick (over L2TP would easily manage 60mbps down which is about my max connection anyway).
Can anyone here help with that as well? Took less than a minute on an old tp-link router I had to get this working, no idea why it needs to be so awkward on these…