Use this website:
http://www.scrabulizer.com/Unlike Scrabble-solver or any of the others, you can tailor this to Alphajax specifically, it uses the correct dictionary. Just fill in the board with what your current game is, and the Scrabulizer will actually work out the very best possible words you can play and list them in order of points.
If, at any point, there is a chance to place all seven of your letters on the board, then the Scrabulizer is definitely your best bet
