boiling on a drop flue

[Outdoorsman0490]

I was able to collect about 75 gallons of sap over the weekend and wanted to do a test boil with my new drop flue hybrid pan and block arch. When I had everything warmed up, there was a ton of steam coming off, when I turned the blower on, I couldn't believe how much steam was coming off the pan. I started the fire around 1:30, and had the 75 gal in the head tank empty by 5:30. One thing I did notice, was that the front of the pan, the syrup pans were roiling boil pretty good the whole time, as was the very front of the flue pan; I had thought that the entire flue pan would be roiling boil. I have attached a few images if the firebox and where the flues are in the arch, as well as the steam from inside and outside the sugar house.

From videos I have seen online, the entire flue pan should be rolling like crazy, which is why the pan sides are so high, right? In order to make mine do that, should I make the ramp more of a ramp and taper it closer to the flues; right now it is appox 1" below the flues the whole way back (fire box 22" long, rest of ramp is about 40"). Also, should there be almost no space between the top of the ramp and the bottom of the flues, 1 " is too much? Thanksphoto 2 (4).JPGphoto 1 (4).JPGphoto 3 (4).JPGphoto 1 (5).JPGphoto 2 (5).JPG

Also, initially, I was getting used to the float box and the pan had somewhere between 1 1/2' and 2' of sap in it; is that just too much? would everything have been ok if there was just 1" in it. Would it make this much of a difference because I don't have a preheater as of yet, and was just running cold sap from the tank into the float box?