Knockback issues

Help and Feedback Scripting Support
1

So i have a knockback script using body velocity but its incosistant. The script doesnt always knock the player up or back as shown in the clip:Streamable
heres the code for the knockback , thats int he server script

						local OppKnockback =  Instance.new("BodyVelocity")
						OppKnockback.MaxForce =  Vector3.new(math.huge,math.huge,math.huge)
						OppKnockback.Parent =  HitHRPT
						OppKnockback.Velocity = char:FindFirstChild("HumanoidRootPart").CFrame.LookVector * 60 +Vector3.new(0,50,0)
						OppKnockback.Name = "Knockback"
						OppKnockback.P = math.huge
						game.Debris:AddItem(OppKnockback,.3)
2

i was wondering if client knockback is better than server knockback?