Yes and no....
The "off power assisted steering" is there so that when you let off the gas, it's to keep you from fish tailing due to a lack of steering from loss of nozzle thrust. But, in the design of the GTX hull, there is this side to side movement in the front of the bow that can be hard to control. It's right inbetween being on plane and off plane.
Now, if your talking about deceleration while your still up on plane, then yes, your OPAS would be the first thing I pointed to.:cheers: