right now i have roto flats on my pbass with spb3 pickups. solid, meaty, huge ballsy tone. Great for rock and fits the band i'm in. I am NOT looking to change the strings atm, don't get me wrong. but I wish to know if there are rounds (yea, i have tried rs66) that exist with a huge meaty low end to them. I've tried ernie ball nps, d'addario nps, rotosound rs66 and possibly a couple other sets. Out of these sets, the roto's had the strongest low mids (big surprise ), is there anything that sounds beefier than those rounds?