Do I need to adjust my firing schedule when stacking shelves

[Geo]

I am loading my Paragon GL24 kiln (front load, top and side elements) with many (16) smallish open face pate de verre pieces. I am thinking of adding an additional shelf with a few more pieces. I'll check on how it all looks when at the process temp, but just wondering if I should adjust the schedule ahead of time. In general, does adding another shelf affect firing schedules?

[rosanna gusler]

oh yes. especially with top elements. side fire pottery kilns are fairly easy to manage with multi shelves but with a top element in play i would say no if you need the same amount of heat work on both shelves. rosanna

[Yardic Glassworks]

I stack in my GL24. Just turn the top elements off and slow way down so that the heat reaches everything evenly. I've found that it works best with at least 6 inches between shelves. Tim