I would have to agree. 28lbs can fly this model clean, but with the gear down and flaps down in the circuit, a significant level of throttle is required for mine with a Merlin 160. If you are hanging all those baubles on it, with that level of power, I imagine you will have to really nurse it round the circuit and will have nothing in reserve. Fly it clean first and see what you think, but with the bigger engine you can always reduce the power.