Difficulty keeping 5 sp @ 65 mph

I love my new insight, but seriously miss cruise control . I try to keep my silver spacepod at the speed limit, but have 2 challenges.

1. It wants to zoom. When going flat or downhill this light, spunky thing wants to fly :twisted: .

2. On the inclines I either overanticipate and overshoot, or not anticipate enough and slowly lose 'altitude. :? '

I believe it may be related to old habits of getting it in 5th gear and keeping it there. Should I be going into 4th when anticipating an incline? My daily route is fairly flat. I commute between Davis & Sacramento: the flatter part of the Sacramento Valley. Most of my 'hills' are man made bridges over rivers, duck flyways/rice farms, and interstates.

I am not capable of installing a second party cruise control. Has anyone had success having Honda install one?

Is there something about my driving habits that I can change?