*Need G29 lift & shock advice*

[Yamahacruiser]

I have a yamaha G29 and have installed a 4" madjax lift and heavy duty springs. The cart rode great when it was all stock but now its really rough. Not happy at all... So first off.. I live in the country. No pavement at all. Im gonna make a cargo box on the back for light duty work nothin extremely heavy but just to work around the farm.

* Has anyone safely used stock springs instead of heavy duty springs with a 4" lift and cargo on the back? The hd springs ruined the ride.
* Also Im debating on switching to a oem 2" lift. Is there anyone that can fill me in on how they perform such as the ride? I just want to run 20" tires without rubbing at all with a cargo box on back. Ive heard that with this lift the ride is close to stock which is what im goin for. Id rather run stock frontend shocks and suspension and stock springs for the smoother ride. Anyone have pics of an oem 2" lift on a G29 cart?
Thanks in advance for answers & help..