2010 Craftsman Lt 2000 deck height adjustment?

Just bought a new craftsman riding mower. model lt1500. 17.5 hp with 42 inch deck. first time using I had the deck hight handle set on 6 the highest setting and still cuts grass to short, matter of fact it scalped the grass. anyway to set the deck higher. Its only 3 days old and still under warranty but the sears store is 20 miles away and I rented a trailer to go pick it up and hate to go rent another trailer to bring it back if its just a simple adjustment.

Park your rideon on a level surface (concrete), disconnect battery, adjust tyre pressures to the correct PSI, lift deck to position 6, place 4" blocks of wood under deck, 2 blocks under the back edge, 1 block under the front edge near the midline, that takes care of your deck being level, next slacken off all the adjusters usually 4, then tighten the adjusting nuts until they just 'catch' and then tighten the lock nuts, all done.
If you run out of adjustment you may have to re-try either a 3 1/2" or 3" blocks of wood.
Don't bother with trying to make the front edge 1/8th of an inch lower at the front, it's not a Swiss watch you're trying to adjust.
What you will achieve is a perfectly level deck, and the maximum deck height that your particular rideon will take, and finally no scalping.
One final adjustment, set height lever to position 3, (once you have done the previous adjustments), then position the small jockey wheels so that they only 'just' touch the concrete.
Then you're good to go.