I would guess the original poster didn't get the responses he wanted. Most of the responses were around that the answer was the bowler playing the lanes wrong....and most don't want to hear that. They want the answer to be switch to this ball, with this drill, and your problem is solved. While there are occassions where that truly is the answer, most of the time it's something the bowler is doing incorrectly or made a wrong choice.

Biggest problem with bowling is the bowler sometimes.

I can at least admit I suck. All me, baby.

in my experience, house shots blend bowling ball reactions so much it would have to be at least a moderate change of the ball. for example changing from 4000 to 3000 wont help much but from 4000 to 1000 youll see a difference.

Actually I don't think house shots blend out the ball reaction so much as they give you options on how to play the lane with almost any layout and surface.  Definition of house shot is puddle in the middle and friction outside.  Want to throw something out into the dry and watch it come back.  Go shiny.  want to hug the oil line a bit more, go with something solid. 

Biggest reason house shots score so high isn't margin of error, but rather every style can find a way to get lined up to best exploit friction for maximum carry.  Also the reason that almost any type of ball can be effective on a house shot.   Things change as balls blow up pattern and force people in, but on fresh their are lots of options.