SwD, you should be able to retain much more than that, but it depends on a number of factors.
First, how much of that weight is muscle? I can understand eating too much and gaining fat and some water weight, then losing that after a cycle, but you should really be able to retain the muscle. So, cycle diet is factor #1.
Factor #2 is training age and genetic limitations. If you’re at your natural peak, then Bill Roberts says you should be able to retain about half your “non-natural” anabolic gains. If you’re not at your peak and you use MAG-10 or steroids to add, say ten pounds, then you should be able to retain most of that. Of course, so-called genetic peaks can be tricky. Most people who think they’ve reached theirs haven’t, so this is tough to pinpoint. Previous usage plays a roll too.
Factor #3 is training. Again, it’s been suggested by a couple of T-Nation’s experts that heavy training is best after a cycle of MAG-10. Don’t jump right into Meltdown Training in other words.
Factor #4 is transition. What do you do after a cycle? I notice that too many people jump right to a strict low carb diet with too few calories. I suggest a transition phase where you may not be eating as much as you were when on MAG-10, but you’re aren’t going into an immediate fat loss diet either. See the “Growth Surge Project” for more info there.
Last, Tribex, M, and Methoxy-7 after a cycle can help you retain gains as well. I think HOT-ROX would be beneficial here too (not all at once, but as an option.)
There’s probably more, but that’ll give you some stuff to ponder.