Really you probably should have already added a super of foundation while the other one was being filled.Thanks for the tip, we are hoping to take the full super of and give them another 2 empty supers with new foundation so that should keep them occupied?
we are hoping they haven't made any QC's but will find out next day or so.
It may be prudent to only add one super of foundation at a time, when it is two thirds drawn and filled with nectar add another super of foundation---and so on. They only draw foundation/build comb for two reasons - brood or stores. If there is a good flow on they go into "nectar mode" and will fill any available space - they don't usually build comb fast enough to keep pace with the flow so pay attention to the brood space you have given them, it could get clogged up.