You shouldn't have bottle bombs -- they may a little over-carbonated, but if you chill them down pretty well, you'll be fine.
Next time, stick the racking cane into the cake, but don't move it. A little of the yeast will get into the bucket, but it will create a little well in the cake. When you get near the bottom of the carboy, tilt it slightly ( while maintaining the siphon) and lift the cane off the bottom. When the beer level gets down to the cake, lift the cane and break the suction. This works well for me.