Victron is not "wired" for direct consumer support. What did your vendor say when you contacted them?
When I have a question, I call, text or email my Victron vendor. He usually gets back to me within a day or two with the answer. On the rare occasion that he doesn't know, he reaches out to Victron and has an answer in another 1-2 days. I did not pay a premium of any kind. Prices were "Amazon or better".
I bought it on Amazon. Requests got routed directly fo Victron. It was not a good experience. Most of the places around here that sell Victron only sell a limited number of their products, none of them the autotransformer. Signature Solar does sell the autotransformer, I eventually got a response from them, but we've had the SS support discussion to death. I can't say I'm a fountain of knowledge around AC feed systems but I have had occasion to connect a "dry transformer" for an application at one time to create a neutral. To this day I'm struggling with the idea of an 8v differential between the legs being "normal". For starters it could exacerbate the problem you are trying to solve if all your load ends up on the lower voltage leg, the Victron claims to handle a 30A differential.
To my point someone was praising them for being small and watching over everything wonderful people and all that, yet after contacting them three times and on the 2nd and 3rd try asking them not to put me in touch with the same people that refused to help me, they did just that. So, while it's great you got good tech support, I'm thinking it was your vendor that was great not Victron per se.
I also think if you want to sell a product that takes 100A conductors (2AWG) you darn well ought to make it a little easier to "fold them in". If the connector is visibly stressed once screwed down, and it requires a series of 45 degree bends in a 1-1/2 - 2-1/2 inch span with three 2AWG wires you did not properly engineer the box. I have pictures, I managed it, and cussed the whole time. I had to have help getting the wires in the box. YMMV, but the EG4 was a total breeze, I pushed it thru 1-1/2 conduit, slight bend with my fingers (instead of mangling the insulation with the Kleins and a cloth) strip criimped a ferrule stuff under the hex nut done.
Also panels are just getting bigger and bigger and better and better. I can't find a component MPPT that will handle 500+VOC and I'll be darned if I'm going to run #4 or #6 up to my panels to handle 50 odd amps and up. For smaller systems with only a few panels it's less relevant but if you start getting upwards of 40 panels (I have 48) do you really want 10+ MPPT's? If I wanted to go Victron, that's where I'd be. There are folks here on the form that like to fiddle with the hardware, BYOBattery banks, and the like, so this kind of thing is probably more fun for them. I toyed with the idea of doing my own batteries and BMC, but I'm also a tiny bit anal, and I really like the idea of rack mounting battery modules with built-in BMC's. If your playing with this Solar stuff, you are going to be running a lot of wire all over the place. Playing around with Victron stuff will not ease this burden, so while I think their gear is pretty it is highly unlikely I would ever buy it moving forward unless they were to create an AIO on par with Sol-Ark or EG4/Lux.