Bending Woes

For a day or so I was quite happy with my new setup.  Then I played this standard riff: 

            -------------------
            ----10-------------
            --7b9--------------
            -------------------
            -------------------
            -------------------

 
and it sounded terrible because the B string went flat.  From a mechanical view, it was clear why this was happening.  Bending the G increases the tension on the bridge, which moves forward, thereby decreasing the tension on the other strings, in particular the B.   

My first reaction was that this was due my having floated the bridge.  I believed this for around a day.  However it seems that this can happen in any case, so long as the bridge is free to be pulled forward by the force of a bend.   This led me to believe that the strat's design was just fundamentally flawed, at least for any player who wants to do bends and doesn't block (or severely tighten) his trem.  However the real world is full of counterexamples and I still don't really get it. Some people on forums say that they have learned to deal with it.  One guy even says he presses down with his palm while bending to get around this.   I don't like that at all.