The low idle on the older model HD sounded good but it was bad for the engine!! The lower the idle the lower the oil psi so when you were getting the potato, potato sound you were lacking oil flow to the top of the engine and that is what would damage the top end. The higher idle is better for the engine and it should be left alone.
08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.
I richened the mixture on my 02,and turned the idle down to get it to do that...
I have toyed with the idea of trying to make my rg do it too,and it might with the right cam,and maybe if I screwed around with the idle settings on my map...I at least would like to turn it down a bit.
2012 FLTRU-Thunderheader,T-max,tuned induction,progressive monotubes,Madstad 16 clear
2002 FXD-T-header+too many mods to list