Hi Robin - glad to hear that Polyfacto Hoods were able to help yet again. You are slightly unusual in that I have not heard of anyone having their hood fitted by Polyfacto before, usually doing it themselves. I think if everyone had theirs "fitted" by Polyfacto then the number of complaints about leaking hoods would reduce to nothing. Four hours is good - I have taken that amount of time over the sidescreens alone - fettling, bending and forming to fit.
Re your KB thingys, you can reduce them by opening the picture in Microsoft Picture Manager, which you should have on your PC, click on Picture, Resize, then click on the box "Predefined Width and Height", and choose a suitable size, ie web 640 x 480 and see how many KB wotsits that gives you. Pesky little KB's.