My previous layout was R1/R2 double track, and I used these 'dog-bones' (as I like to call them) on all the curves to stop them pulling apart.
On my new layout, I have used some R3 LGB (and ART), and although I noticed the larger gap, I've used rail-clamps so I haven't had the issue.
The only instance I've use the dog-bones on my current layout, is to hold track together where I've installed the (yellow) LGB isolator joiners....