I believe it depends on shot.
Heavy oil but dry sides...the great low rg heavy load particles today and a few years ago are GREAT for that!
Reaction Roll, ARC, Scorcher, Pro Zone Azure, BVP Mammoth, Mayhem. Awesome. One can get feet in oil...aim out to dry and kill!
BUT for flat heavy oil...the solution I believe is method and selecting the right backend!
Method...ball down low...crowd the approach, walk slowly, look at the dots, point(crowd your mark with your feet).
I've used everything from a Pro Zone Azure to a shiny pearl Battle Zone bullet and had a lot of very good sets on the "Soup" of the day! Demolition Zones, Pro Zone Violet, BZ Bullets and Track Spells...have killed for me.
OFTEN Higher RG balls like the spell allow me to not have to belly the ball away from the pocket and encourage pointing! SWEET!
REgards,
Luckylefty
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Open the door...see what's possible...and just walk right on through...that's how easy success feels..