I looked at the FPCT ratings of the players you listed for the positions that you are playing them. All of them are pretty bad. Kapler has the worst at .01 and Jenkins and Cameron have the best at 3. Encarnacion and Nixon both have a FPCT of 2. From these ratings I would expect you to have more errors than other people with Kapler having the most. Kapler is rated at a 5 for CF which is decent and should probably play there and move someone else to RF. You would probably get a fielder anyway. You might check the manual to see what the penalty is for playing OF's in different positions that they are rated for.
Good luck!