They're not saggy, they're just really big! This heavy and natural titty shape comes to us from a slew of sources from the adult film industry; mostly taken from the late 2000's. You can get lost in these funbags for hours! And don't get anything caught underneath them, you're likely to get circulation cut off with that kind of weight pressing down!

MH3
0.8 or 0.9 is usually enough

Krea2
Similar to ZiT, around 1.00 should be fine.

Z-image Turbo
This one worked pretty well at full strength; I usually was at roughly 0.95

SD1.5
By request! Here it is! I had to keep it closer to 0.5 for strength, going closer to 1.0 made the gens focus on the chest and stomach area while cutting the head off from view.