[pcs0snq]

Back in the day when you could buy an aftermarket CC it was tunable. You could make it less aggressive. That is doable if you could modify the ECU program.

I'm a controls engineer and if I could design one from a white sheet it would have a 2nd Eco mode. In this more when you changed the "set point" it would be setting the desired manifold pressure. It would be the best way to do what you want.

It's all academic because the Honda ECU in a black box and no that I know has any way to modify it even a little bit like taking the Gain and Reset in the CC loop.

other options to consider....
I have not looked at mine yet but there is a servo that controls the throttle and may be a separate one for the CC. If there is you may be able to restrict the vacuum if thats the power to move the throttle or use a capacitor filter to slow it's response. Theres a good chance because it's FBW throttle that the servos is the same for normal throttle. If it's like that you can mess with it at all.

if this helps hit my rep.