I have two D2.
My condensers have bubbles and specs as well but they do not show up on my prints. When I got mine, I took it apart and cleaned everything including the condenser. No, brighter bulb won't fix it and will give you another problem. Omega says if you are going to use a bulb greater than 75 watts, you have to use heat absorbing glass and an active ventilation. Your film will bake and pop without them.
How bad is your condenser? Which size? (what's the diameter?) Where are you? I might have a spare. I'll have to look.