Gurley/Bell trade advice needed.

Having to do QB shuffle every week, which has worked well some weeks but not so much in others. What im thinking about proposing is my Gurley for A. Luck (#2 QB for #21 RB) OR I've even thought about L. Bell for A. luck/M. Evans. I have decent depth at RB but WR and QB could use some upgrading. Just not sure about parting ways with Bell. Gurley has been a disappointment besides 2 games this year but hes not all to blame with their QB/Oline quality. 10-team, standard scoring. Thanks!