Did you bleed the air from the forks? It needs to be bled with the front wheel off the ground. Although slow rebound could eliminate that as a potential cause. I'd check it anyway.
Were the forks ever revalved for a heavier rider? You may need lighter springs and valving.
You should bleed the forks before every ride...when they are at room temp. They will pressurize as the get hot so only check it when cold. It gets in under the fork seal as the forks move up and down. It is a very small amount each time but as you just found out it can add up! Those forks move a lot when you ride,
man, i would say so, it was like an air compressor, i was like , oh crap i just let the nitrogen out or somthing, then i was like wait, there is no nitrogen.
No, oil shouldn't spray out, it would cause there to be vacuum in there when the forks extend. I'd imagine you'd risk drawing more dirt and crap into the seals if you did that, not to mention they would probably ride funky.