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I have a Vacmaster 350 and it has pulse and manual seal functions. These allow me to control the amount of vacuum. When I see the the juices beginning to rise towards the sealing edge, I stop the suction and manually seal the bag.
Chamber vacuums are for this. They don't suck the juices into the seal. And the bags for a chamber are about a third of the cost of suction bags. I just ordered the Duo 550 from Vacuum Sealers Unlimited. It has a chamber and can do suction bags. Best of both worlds I hope.