I was doing some rereading, Fuji was using moderate force here on Law yet had him subdued and pinned down. He escaped with room when Fujitora was distracted by his men.
He actually doesn't need much gravity to completely immobilize people. When he fought Sabo, Sabo could only escape the gravity by turning into fire (since his fire form eludes gravity).
So why he try to send Zoro to hell lol?
People don't give Zoro enough credit for how built different he is. No DF, only person to fight through that force and send an attack.