Having just gone through the warped plastic woes myself recently, get a thermometer and heat water to 180-185 F I found that hotter makes parts go to weird shapes real fast. Start with 4 seconds and if that doesn't work add a second or two at a time until you can "just" make it bend to where you want it. Then running cold water over it while holding it in position usually locks it in place.
You mogh experiment on a couple of pieces of scrap sprue first as well. Use a pair of long tweezers to swirl the part in the water then while it will be warm it shouldn't be too hot and you can shape it with your fingers.
Hope that helps.