I'm growing a Blue Dream right now and it's a strange beast. It's so sativa dominant it's flowering doesn't match anything I've grown before, and the leaves are so long and so narrow. I'm on day 30 or so and the buds are definitely thin/airy and behind the other plants. I expect it to go much longer than the rest. I expect they will fatten later on but it's new to me so I'm not sure. I'd say hang on and wait for it. What day into flowering are you at?
On the pale leaves, not sure but I now have a list of things that seem to cause all my problems, in order of most likely:
1. pH
2. Too much light
3. Pots too wet (Coco with not enough perlite right now.)
Every time I see something that doesn't look right, it's one of the above.
Of course your doing dwc so your issues are pretty different than my coco. I should add that I too have found that during veg the pH wants to rise, and during flowering it wants to drop. Likely due to the shift to more phosphorus and potassium in the nute mix and the plants pulling more of that out. Potassium seems to be a big factor for my current grow.
My Blue Dream is also having more yellowing leaves at the bottom of the canopy compared to the rest of my plants so your experiences seem to match mine.
I'll be following your Blue Dream with interest!