This BigBox just keeps amazing me! 47 hour print, now I give it a relaxing break til I think of what I'll print next and wait for more filament to arrive... LOL! http://www.thingiverse.com/make:212165
I don't believe you should need to... Here's my post with the Simplify3D profile I setup for PLA that I have been using for quite sometime successfully. Have a look and compare it to what you're settings are. My settings are for the Pro, not dual. http://forum.e3d-online.com/index.php?threads/sharing-simplify-3d-profiles-for-bigbox.633/
I was running into issues when trying to print a cyclinder. You printed the rocket before right? Could you post your gcode if you still have it for that rocket I am curious about something now.
Thanks, I have a while thread about trying to print the cyclinder and the conclusion was the Rumba wasn't fast enough to handle the number of instructions per second so I ended up at 30mm/s