if you can fit larger curves go for it.minimum will get you by,but bigger is less stress and looks better.i have experienced this with atlas maxi stacks.they say 054 minimum but does not look good and i can see strain on couplers.i would always go for the biggest curve space allows.my little table is 7x8 just to allow me 072 curves.you can always put smaller stuff on a loop inside big loop
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