Personally I would not use pull - pull setups on elevator unless you are very meticulous with your installation and ongoing maintenance. It really does not offer any benefits except for some weight saving. DEPS is a better option if you dont want to use a single pushrod. Elevator tracking and alignment probably has the greatest impact to trimming a model to fly true. Pull -Pull on evators just has to many variables to make it viable ant it is almost impossible to setup properly unless it is planned for during construction of a new model - and by that I dont mean assembling an ARF.