I've heard the same thing, ie it should carry half the bombs it does.
Having said that, with over 4 hours endurance you also don't need a full load of fuel. I haven't researched the real tank sizes but with that much endurance I suspect they modeled the reserved tank in with the standard tank.
Many RE8s had the reserve tank sealed off because with its position it would catch fire every single crash making pilot death very likely. Without fire, it was sometimes possible to survive some of the many screwups pilots made with this machine
In general for takeoff, keep the stick forward and don't pull back. The plane can takeoff on its own when speed is high enough. Takes ages but it gets there. Treat it like a Handley Page
