My point is that I have never seen a Despero strength feat that was greater than WWHulks strength feat on Sakaar.
I think you are miscalculating the issue of strength here.
Despero demonstrated immense strength in KO'ing a group of high heralds in a matter of moments.
To the point of strength that I think you are referring to, Despero lifted the Rock of Eternity without breaking a sweat.
Both feats are a clear indication that Despero is "Strong" enough to KO WWH before he amps up.
If this were a bench-pressing contest, my money would be on the Hulk in terms of strength.