I think your main problem is your just not used to board pressing. ONce youbecome accustomed to it you'll up in weigth much more, work it religiously for 2 to 3 more weeks I bet you see a peak in performance, good lifting though.
Also, many may disagree here, but I would NOT go single crazy, stay with doubles, like I said I expect everyone to disagree, but for me I do not go single crazy.
Mike