Most modern amps have some kind of protection circuit and will cutout if over temperature or an over current is detected. It is perhaps a sign that the amp or cab has a problem. The other option is that you need a higher output amplifier.
Be aware that you cannot use an instrument cable to connect the cabinets. The cable is nit designed to take the high currents involved and neither are most jack plugs. I can make you a cable or you can use some of the reputable companies online. To ensure you know that this is a speaker cable, I suggest a jack on one end and a Speakon on the other. Use either Neutrik, Cliff or Amphenol speakons and Neutrik Jacks,
Nice work although the tone has little to do with the wood species used for the body. Mass of wood can vary enormously between samples of the same species.
The neck wood has more influence than the body, obvious when you realise how much more neck is under the string than the body.
One of the issues with most tweetered cabs is that they don't take account of the difference in output between the woofer and the tweeter. It ia not just about putting an L-Pad attenuator in circuit. you also need a properly designed crossover to make sure there are no peaks or troughs in the response.
While bass guitar and upright bass do not need to go flat to 20Khz, any shortcut in the design will show up in the sound and most quality HF transducers will go up towrads 20KHz. A good trick is to listen so some audio from CD. Choose a track you know well but one with say female vocals, Sade's first album is a good one to start with. @stevie also uses Dire Straights, don't use a track with distortion initially as it can mask what is going on.
Back on track. The phrase "suit beginner" was code for virtually unplayable in days of yore, The tye of instrument with a bow that Robin Hood would appreciate and frets that resembled a slalom course. To add to the list:
Heft
Warm
Dirt
Any adjective used to suggest a feeling when listening to music/audio.
I did not realise that and I should add that the 700+ watts from the Bugera, like allmost all amps, is at 4 ohms. I usually use it with an 8 ohm cab so 350 ish into that.
I will try to measure it when I get my gear out of storage but the Bugera Veyrons are probably somewhere between 700 and 800 watts RMS. It is important to keep these companies honest and Music Tribe do seem to have a problem with specs (Bugera and TC are Music Tribe brands). What I will say is that my Bugera Veyron is the most powerful amp I have ever used.
I am not fussy, if I cannot hear noise, I do not mind. Of course careful wiring of the ground, earth, 0V will mitigate all noise but In my experience, true isolated supplies ar the only way to fully eliminate noise and hum.