"WOODNTHINGS": Thanks for the video links, very helpful.
"DOMONIC": This is an old planer that my landlord is loaning me, no manual. The U-tube videos helped. At least now I know what to practice.
"GEORGEC" Thanks, I am doing that now.
EVERYONE: Thanks so much for all the input. I have started using the suggestions given and the problem is just about cleared up. I now get the cuts down to .003" gap along part of the 6' boards.
When I began the glue up I saw that as I suspected, clamping in the center closed the gap at the joint and accentuated the bow on the two remaining edges. So I glued them up in pairs and then restraightened the edges of each pair then glued the 3 pairs together giving me results that I am good with.
Thanks to all again!