7.0 won't cause any real problems. 7.6 and upwards will. Continue with what you are doing, except do cut back on the nitrogen.
If it is the Blue Dream in particular, that has "stalled", this seems to be a habit of this strain. Both myself and a friend have grown this plant multiple times and we have both noticed that Blue Dream has a habit of having a 7-15 day "sleep" about half way through flowering, then taking off again to finish and bulk up quickly, during the last third of the flowering phase. Hope this helps.... Organoman..