Waco, I have the DP Ultimate with the stock G-26. Very few flights, but here is my .02 cents.
Had to add approximately 24 oz. of lead in the tail to balance. Moving the servos' aft will help but you'll still need to add lead. This combo will fly with very smooth, IMAC type aerobatics with no problems, take-offs require minimal rudder input. Keep the power on in approach, wing loading is very high with combo, power off and it sinks like a stone. As soon as I can "find" my workbench, off comes the G-26, on goes the ST 2300.