I'm curious whether your grill has a front vent in the hood. In the LBE setup, without a vent to set the airflow, the hot air essentially gets trapped, ruining the convection aspect that provides the top char.
Could you take a pic of the grill with the lid shut?
Would you be willing to make a vent in the lid, or fabricate some skirts that would allow you to prop up the lid about 1", but seal the grill except for a 1" high by 3" long gap in the front?.
Not that I'm encouraging you to have the same issues that everyone else has, since you are meeting with such good results already - I just wonder whether you could achieve a NY/NP hybrid.
Here's a pic you can zoom in on.http://www.hayneedle.com/sale/webergenesise330gasgrill.cfm
I'm still not done experimenting, and I would like to see if I can get more heat to the top side. I'm thinking that a vent in the grill lid is not going to help all that much if the internal oven I created is the main bottleneck for air flow. So I could test your theory about air flow by boring a vent hole into sheet metal of the oven I created. I could also attach some sheet metal to the front of my contraption and then simply lift the Weber grill lid to facilitate air flow.
Before I go to all those extremes, I have some other possibilities:
* Remove the flavor bars on the outer 2 burners to allow heat to flow upwards more freely.
* Raise the hearth towards the oven ceiling which will be hotter for top baking.
* Begin the baking cycle with the hearth preheated to a lower temperature and then put all 3 burners on HIGH for the bake.
* Add more mass to top of the sheet metal using plates of steel, or iron or even tiles as a means to hold more heat in.
* Add insulation or some kind or heat blanket over top of the sheet metal as a means to hold more heat in.
* If the above 2 experiments resulted in very little change for increased top heat, then it might make sense to add top venting to my oven contraption.
Ok back to the airflow issue of the LBE. Can you point me to a thread that has pics and discusses that venting solution?