A trick that works a treat on the Bell 204/205 single hydraulic versions and Bell 206 as well as the Sikorsky S-58T with the Aux hydaulics out.....was to apply a very gentle pressure in the direction you wanted the cyclic to move and wait while the feedback forces motored the stick to the desired position and then relax until you needed to move it again.
The collective on most Hueys was easy up and hard down which could be a reason to eat Gorilla Grits in the morning but still not a big deal.
I always felt I was carrying the helicopter with my left hand when doing without the Aux Hydraulics on the 58T.....perish the thought of a two hour flight like that.
Having never flown the 350.....does any of that sound like what a 350 flys like without hydraulics?