You are having an issue using the travel, correct? I would think you have standard 7.5 wt oil. Make it thinner.
But before that, remove all of the preload in the compression preload and try it. Then remove a little air and try it. You likely won't have to change the oil. You may find for your weight the springs + compression preload + air preload = too much for your weight.
I can run a 2004 dj2 with air preload pumped up and have a hard time bottoming the fork with medium springs. I am 270...that should tell you something about how stiff those fork feel. They are meant to feel like a rigid with some give and only under the most extreme circumstances will they 'give'...