My spring harvest is mainly OSR. Weight wise it is about equal to the autumn harvest. The majority of my customers ( regulars and word of mouth) express a preference for the spring crop. If you suspect any OSR in your crop, get it off early. I can see the fields round my apiary, which is situated on the edge of town, and take off the spring crop as soon as the OSR fields go over. Even then some will have set, but I am too lazy to extract more than once per crop. As above, lots of the frames will still be uncapped but pass the water content test. ( a shake at the apiary and refractometer in my extraction room) . Set frames ( not all cells will be set solid), get a spray of water and are given back to the bees. Does not seem to affect setting of the Autumn crop, which I presume may have a higher fructose content, as my Autumn crop ( the little I have left) is still runny and clear - not heat treated.