RUDY - The 44" decks should actually do a good job mowing if everything is in decent shape. Like Scott says, check the condition of the baffles, make sure there's no built up grass under the deck and the blades are sharp and mounted the correct way.
A thin accumulation of grass over the whole underside of the deck is O-K, but clumps in corners 2-3 inches thick effect air and clipping movement. There will only be baffles around the inner back side of the outer blades and the back third of the center blade because the deck housing stamping makes up the rest of the baffle around the outer blades. Blades don't have to be razor sharp but do need and edge about 3 inches long. All the cutting is done with the outer most half inch of the cutting edge, make sure those blade tips are not rounded back, the front side of the blade should come to a square corner with the end of the blade. Look of pic's of new blades on CC Specialty's web site for comparison.