Where can I get a 5lb funtana? I'd love one. I've had 3 now and everyone of them is coming out at the exact same weight. With a 72 it weighed just over 5lbs 12oz dry. With the 100, it is just over 6lbs dry. I think as long as you keep it under 7lbs you will be in great shape. Mine is portly at 6lb 9oz full of fuel. To be completely honest there was absolutely no difference in flight performance (except for power) or landings. I think the 61fx will be excellent. Much more power then the saito 72. You just won't have that crisp low end torque of the 4stroke. I also vote for epoxy on the cf supports. CA will give out within the first few flights.
Hope this helps
Al Renkel