My new suggested range is:
1 to 24
24 to 55
55 to 100
100 to 150 tl4-5
150 to 174 tl5+
174 to 200 sec7 twinks can try top tl5 BS twinks for example
200 to 220
It isn't 100% sure that your new BS will run with your ranges, so e.g. if range 24-55 doesn't run, level 55 can join at least higher range 55-100 and people can choose what they want.
The most important for these ranges is challenge! Are you boring to be TOP in your BS? Do you want change? Sign up for higher range!
This option should be there, in NW you won't fight 100-150 with your 150 twink, but mostly only with 150+!!! So you can try both sides lower and higher twinks.