I've used the same kind of false bottom your using, and they use to drive me nuts. Just like you I thought I solved my problem by hard piping, still no good. Switched the the slotted style and was amazed by the difference. In the hand it feels much more substantial, I'm not sure if its actually a heavier gauge steel or if the design makes it feel like it is. With the style your using the rim of the disk has a lot of partial holes, which makes an imperfect seal even worse. The slotted design (as you can see in my picture) has a smooth rim, which makes a better seal. The flow rate you can achieve is better than the older style, however if your using a pump don't go full throttle, no matter how good your filtering mechanism is you can still compact your grain bed.
With your setup, I'm assuming, you have an elbow with a compression fitting on one end and a nipple on the other. The nipple side goes through the hole in the false bottom and it looks like your using the lock nut that came with your false bottom. Instead of bending the SS tube you should be able to tighten down that lock nut which should put pressure on the false bottom, pinning it in place.