Looser better than tighter. Too tight, and . . . suspension compression tension may compromise shaft seals, accelerate chain and sprocket wear.
If you adjust within specifications, fear not. I'd suggest favoring the loose end of the envelope.
The absolute, sure-fire, zero error chain tension procedure involves compressing suspension to maximum dimension between drive and driven chain sprocket center lines, and adjusting chain just snug at that point. Suspension can be compressed with ratchet straps, or by disconnecting shock/spring assembly from frame.
(My opinion/perception only above; alternate, corrective, and clarifying comments welcomed!)
“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre