Yeah, that's my experience in a nutshell. You can tune down to A0 with budget gear and everything should seem mostly okay. Every semitone down below that point, and you need to do something clever to mitigate the problems you'll run into - and nothing is as straightforward as it seems to anyone who has never tried to tune that low before. Once you get your feet wet, though, I think that the paradigm will shift for you and you'll continue tuning down as you like, just in a more creative way than you thought you would when you started (I'm saying "you," but speaking for myself in the second person). After messing with all sorts of string gauges and different amps and EQs and settings and preamps, etc., I came to the realization that everything helps, but that increasing the scale length of the bass is the most powerful tool in tuning down. G0 @ 35" is doable, but kind of a pain. Once you have a rig that can pull off G0, I guarantee that if you plug an extended scale bass into that rig, you'll notice an improvement right away. The Dingwall has the added bonus of some really nice ergonomics and electronics, so tuning down to F#0 or F0 should be an easy adjustment, comparably. Personally, after I achieved tuning down to F0 with lighter strings by adjusting my mindset and my technique, I went back to G0 anyway...in fact, I typically tune my bass one step below standard 5 string tuning, then drop the lowest string a whole step when I need it. I think that if I had unlimited resources to put toward a custom bass, I would opt for a multiscale with a really long scale length, then also go for a two-fret extension, so I could tune the low string G0 and have a massive scale length behind that, but still essentially have fourths tuning for finger positions.