There is a product called Plasti-Zap that might work better...I've heard it helps with gluing clear plastic parts, but haven't tried myself.
Also, if you keep a fan/hair dryer blowing on it while the part cures that could help. This will also keep the air dryer - super glue cures with moisture, and the fogging is caused by moisture in the air curing the glue vapors.
I don't know what type of plastic the ramps are, but if you can find that out you can lookup the best glue to use on them. I suggest emailing a glue manufacturer like Zap or Loctite and ask them which of their products they recommend and describe your issues. They're usually very, very helpful - I've dealt with Loctite on the proper products to use for certain automotive applications and they made some good recommendations based on metal types, temperatures, stresses seen, etc.