Part of the problem is that humidity condenses quicker the colder it is, so a cold horn will worsen the problem. Humidity from your expiration air will condense on the cold surface of the neck. Thus, the advice about air is very important since the increased air stream not only "blows away" the fluid, but also heatens up the horn so that there will be less condensation going on in the parts nearest to you (mpc+neck). While, in the long run, it is better to go for the increased-air-flow-strategy, I think, a quick fix for the problem is the following: Just tilt your sax (and body) position a little forward while playing, kind of letting the sax hang by the neckstrap instead of pressing it out and up away from your body. Then , the fluids will drain down through the sax instead of floating back into your mouthpiece. Many serious tenor players are using this position (although, maybe not for the same reason

), among others, I saw Bob Berg in a consert, and he was holding the horn tilted forward that way (and I guarantee, I did not hear any sound of spit, that is for sure... )
Cheers