With most everyone else wanting to push their saddles back and "balance" themselves on the saddle with no hands on the bar, I hesitate to point you in that direction as IMO, most go too far back. I've always carried a certain amount of weight on my arms and upper body so I can have my saddle more forward and get better power to the pedals. But I don't use aerobars, however that comment is not a view one way or the other about them. I just don't need them and to me they seem awkward for the maneuverability I want.

But if you are having issues with your upper body and arms getting tired after 20 - 30 miles, then maybe you should consider moving your saddle back some. Pains of any sort will fatigue you and impair your performance in the long run. And possibly bikes that put you in a position where you need aerobars won't be the best geometry bike to move your saddle back without other issues.

Strictly just my 2 cents. I don't know anything about the reasons that might well be very valid for why you have for going that route.