Is using 1 die when all but 1 piece is in home and the last piece near home ok, or do I use both dice like usual?
If there is no specific rule that allows you to change the dice usage at the end of the game, then you must roll the dice as always. However, after reading the rules more carefully, rolling only one die would actually be a disadvantage. The dies are used separately, not necessarily added together to move. That is, if you are 3 spaces away (a move less than 7 as you stated) and you roll a 4 and a 3, you use the 3 and it's done. 

From this website...


  Die may be combined to move one piece, or may be used separately to
  move separate pieces, but you may not split a singular die to move two
  pieces.