Oh man, so much advice here telling you to BBB.
I don't know if I read you wrong, but it seems that you are complaning that the frame changes when you tighten the ballhead or when you release your lens/camera combination after tightening the ballhead. Frankly speaking, for the former, 55-250 + most cameras should not be an issue, this is common problem with ballheads + telephoto lens or macro lens, and is called "lockdown movement".
Even getting a Markins or RRS *might* not solve this problem. Please see RRS reply to customer who is complaining about same problem in thread below.
http://photography-on-the.net/forum/showthread.php?t=503239
In any case, if you're talking about propping up the lens when tightening the ballhead, then there's an additional problem of added tension when you release your lens. It's only natural. My suggestion is to get a sense of how to control this, if you must really do the propping up thing, or use of a geared head instead might help if it really, really, really niggles at you. Otherwise, you might end up spending loads of money on something which still doesn't make a difference for you.
Other threads:
http://photography-on-the.net/forum/archive/index.php/t-85666.html
http://photo.net/nature-photography-forum/00Lzr6