I was having problems using either a T-Bazooka Screen or a Hop Stopper screen in my kettle, from clogging due to hop pellets + break material, and from leaving an excess of wort behind in the kettle. I took the Hop Stopper out and recently have been using either a suspended paint strainer hop sack in the boil to hold the pellets, and/or passing the beer thru a strainer enroute to the fermenter buckets, and I've been emptying my keg kettle this way, meaning getting all the liquid. The amount of break material left in the strainer depends on the beer - for dark beers all the break material makes it into the fermenters. It's been a few brew sessions since I tried straining out break material during the boil, but I've used this approach as well.
In a NB Forum thread I was reminded recently that it is generally accepted that it is best to leave the break material behind as discussed in: http://www.brewingtechniques.com/library/backissues/issue1.4/barchet.html
I am considering adding a piece of copper tubing that collects the wort from the inside bottom edge of the kettle, after whirlpooling to concentrate the break and hops in the center, like lots of people do, but I'm trying to be as efficient as I can in terms of leaving as little of liquid in the kettle as is possible when determining my method for emptying the kettle.
I've also read from some experienced brewers that they don't think break material in the fermenter is a significant issue. Personally, my beer remains high quality, but I want it to be the best I can make it!