Loose is the only thing I will run, why its more consistent and more MPH, if a converter company tells me 6200 I tell them 6400.
Example here from this year at 131, my tight converter runs identical 1/4 as my loose but the tight converter is 4 faster to the 60ft and 3 faster to the 1/8th. 1/4 MPH is 4 better with loose and its deadly with the loose converter, its common to see people want looser instead of tighter stuff.
There is 500 difference in stall between the tight and loose ones I own.