My4, what 5CS said about adapters is a great point.
I would say the Draw on your BP is the norm for the average 510. If you really like the airier draw, a 510-510 adapter would make a world of difference. only downside is added height
Personally if it were me, Id go to a 808/901 cap on my BP with a 808->510 adapter. These work perfect for adjustable draw and let me go from annoyingly tight to wind tunnelPerfect adjustable draw for under 20 bucks. a 808/901 with a 510 adapter is the same height as the standard 510 cap
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Good point Ruppy , maybe try the My4 ??? not trying to get you to spend $$ just saying .