Like others have said: it's not in character for Johns-era Hal to go into every battle with his 'God-will' fully activated.
-Sinestro
-Krona
-Volthoom
-Nekron
-Parallax
etc.
They were all beating Hal initially. It was only when his 'standard' wasn't good enough that he dialed-up his willpower enough to win. As far as I'm concerned, Hal's will is just as dynamic as Hulk's strength, but that's neither here nor there...
Point being: Hal can obviously win if his God-will is in full-swing. However, I believe it is also within Vulcan's ability to beat him before that ever happened.