I have never had a problem with pp'ing a H16 solo, but with two adults and medium air, you had better be on guard. On the 5.2, even with and adult crew, I sometimes have to tell them to move forward to push the hulls down a little. I actually like the bar going through the middle. It makes a good place to put your foot for leverage. I lifted a hull too high once on the H16 and almost capsized because I went sliding down the tramp. The bar is very convenient and despite its name, doesn't get in the way of your knees during tacks. Side note... I'm relatively small so I can duck the boom and tack pretty easily. The H16 tramp is much less cluttered, but once you trim the sails and are moving along, there is plenty of room on the Nacra... again, I am only 150#/ 5'9".
-Rob V.
Panama City
Nacra 5.2