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I am sorry to hear that you also are struggling with this level. It really was a horrible level and it took me many, many months to finally complete it. I was so close to deleting the game. You are right, the game isn't fun anymore. It isn't a game you can just play for a little while, pass some levels and play again later. It has become a game where you can be struggling on the levels for days (or months), where is the fun in that? I wish someone from King would reply to this post and answer the questions we have all raised.
Alessandro nailed it. It seems like the only way to pass it. I'm on 711 and there hasn't been a repeat of this frustrating board, so don't give up : ). On your first move, create a 4-letter word using the most uncommon letters possible. When the bulk of the manuscripts open, scan for our favorites: ed, ing, er and ine. As Alessandro advises, you'll need a huge line-blaster on this second move to succeed. If it's not there, I recommend closing and reopening until you get at least an 8-letter word (hopefully your first 10-letter). On the third turn form another 4-letter word using hard to place letters. Fourth turn trigger the lineblaster. Scan carefully for possibilities and if necessary create a couple of 4-letters or another large lineblaster. Make yourself resist anything else. : ) If you've created two or three more crowns and still don't have a 10-letter word using them it's time to close down and try again. Otherwise you waste moves when the lineblasters created by 10-letter words trigger and wipe out extra crowns. Alessandro's strategy plus limiting my time (frustration!) on loser boards helped a lot.
P.S. I don't buy anything or use the extra moves (because I spent waaay too much on candy crush), so it is possible to do without $$.