There is a 3rd option ... keep your FS2 and ask for some help with setting it up to you liking.
I have driven all 3 (Dingo, 511 & FS2) and to be honest I found the Dingo far too point-n-squirt for me and nothing I could do with the setup (in the 1 day I was working with somebody to help them get it to their liking) could make it feel smooth and "tame".
The 511 is indeed a very smooth car to drive and it seems to be relatively difficult to get it to the point that the setup is so far off it is undrivable, that tells me it's very well balanced. It's a nicely made car too, in fact the only thing I could say against the car is that the drive train is very open so it WILL require more maintenance than any shaft drive car (but to be fair that's try of the majority of belt cars).
The FS2 is almost maintenance free (so long as built properly the first time of course), very strong (there are a couple of areas where changing the length of the odd screw or similar improves strength though ... happy to explain) and really tunable. That tunability means you can get it to feel however you want it to feel but some people need a little help to get it to the point they like it (as njc11 or me and we'll go through the car with you and advise).
So I'd rule out the Dingo (personally I am not keen on the rear end geometry as that is what makes it so agressive) which leaves the 511 and the FS2.
Obviously I've chosen the FS2, I make no secret of my passion for the brand but even if that wasn't a factor I simply don't have any spare time so the car starts one meeting exactly as it finishes the last ... right down to the cells still being in it sometimes!! There is no way in the world that any belt driven car would continue to perform for months at a time treated like that, as an engineer I'd not expect it to either.
So for simpliity of ownership and tuning options to make it feel however you want it to then the FS2 has it in the bag.
If it has to be one of the two mentioned in you first post then go for the TRF511.
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