Jointing long boards
I'm creating a Bar top from old growth pine boards slabbed to 2" thickness. Each of three boards to be joined is 11" average width and 12' long. I'll need 11' final length for the bar top. The middle board was ripped lenghwise into two boards. Both were edge jointed on my 7" jointer and then thickness planned so I had two 5.25" boards to glue up for my middle section. I used the 4ft aluminum straight edge to check the jointing results and as I move down the length of the boards there is only slight gap at the midpoint (looks like 1/32"), but when I put the boards together to see what the glue up will be there is 1/4"+ gap at the midpoint. With 2" think boards that's more clamping pressure than I want to introduce.
I've never jointed 12' long boards before on the jointer and the 6' long boards that I do all come out appearing dead flat. Even the 8' table I did last year came off that jointer near perfectly flat. So I don't get what's going on here.
I took a couple of hours to go through the jointer setup, the tables are co-planar within a few thousands, (i did add a shim to the outfeed table to bring it closer from where it had been). I've set the blade dead even with the outfeed table, and the infeed table is dropped 1/16" below the blade/outfeed.
Putting the boards back through the jointer for three passes each has not improved the gap at midpoint between the two boards that I can see as it is still about 1/4"
Any ideas on what I'm doing wrong? Am I just asking too much from the old jointer I have? The total length of the jointer tables are just under 4'.