What Jim is reporting is THE problem with Pierco...and why I am almost through getting rid of 700 frames I bought and foolishly installed.
The only real solution is to cut the BOX. It is easy to do with a table saw. By doing so correct bee space will be restored. How much you have to cut, whether you have to cut both top and bottom or just one or the other, etc. depends on who made your boxes. Do the measurements. You need no more than 3/8th from the top of the Pierco frame to the top of the box, and then no more than 3/8th from the bottom of the Pierco frame to the TOP OF THE PIERCO FRAME beneath.
But if you want to 'mix' wood and Pierco, forget it! The Pierco frame top bars are poorly designed and it is clear they are not about to buy new molds.
As far as drawing them out goes...most try 'too soon' in the season. Don't even think about trying until sweet clover or basswood bloom. Then put them directly over a brood nest AND FEED SYRUP. They will be drawn just fine.
Lloyd Spear, Owner of Ross Rounds, Inc. Manufacturers of round section comb equipment and Sundance Pollen Traps.