Yes you should, That's what I always do when I'm stuck with a coin it works 95% of the time if its not a hardfork problem or a very specific one. Once you cleaned the roaming folder you only need to launch the QT(exe) again no need to delet/reinstall. You can let the wallet.dat in the folder too(in fact you must otherwise it will create a new wallet.dat with a new address).Don't forget to make a copy of it anyway ! I dont know if there is a bootstrap for ftl but flutter speed make the blockchain up to date fast enough.
Too bad I had no orders sub 60