I secon or maybe that is third the recommendation on moving the tear empennage control servos forward, ahead of the CGpoint if you can. As for getting control back to those rear surfaces, don't use rods, use cables. Once you have done that, since you have moved all the other weighty items forward, you can then evaluate just how much weight you will need to add up front. The ideas others have mentioned that put the weight up in the nose without resorting to putting it on the cowl itself are good ideas. It will take some thinking and work to build those platforms to take the weight, but you will be better off in the long term; no cowl deterioration.

Lars