Scott - I have been using an empty blue steel pan about 4 inches above the pie. Do you think the ceramic tiles would be a better solution? Which material is best for this scenario?
John, assuming that you've still got your Wolf oven and are using it's convection feature, your question brings us into an interesting theoretical realm- specifically, thermal mass and it's impact on radiation. This isn't like one of those cheap, relatively worthless, single ply steel domed ovens with no insulation, where it's practically impossible to maintain a dome temp for producing fast bakes. There's no insulation above your pan, but, thanks to your convection fan, the pan is enveloped in flowing hot air and should be at or near the peak temp of the oven. My gut feeling is that as you open the oven to load the pie, even for a short time, the blue steel pan will most likely drop a tiny bit further in temp than 1/4" tiles and this might impact top browning. Maybe. Tiles are inexpensive, and, unlike the elusive quarry tiles, regular glazed tiles are easily found so my suggestion is to give it a try.
Although I wasn't specific with Deb before regarding color, your mention of blue steel reminded me of the importance of a black glaze, since darker colors are better emitters.
Scott - my fibrament is larger than the steel, do you think I need to cover the entire shelf above the steel?
Deb, a stone and/or tiles that are larger than the steel plate is great. Since you've got a 14 x 16 plate, then a I'd say a 16 x 20 ceiling, or even 15 x 17 ceiling would work nicely. I would make sure you've got an extra .5" on all sides, though.
As far as the fibrament goes, though, the size is fine, but the thickness, unfortunately, is not. Some thermal mass might be a good thing (see above), but we can definitely have too much- and a .75" fibrament is too much. Anything you put in an oven will absorb heat. The steel can be fully pre-heated in half an hour, but the fibrament might not be fully pre-heated for another 45 minutes past that. 1/4" tiles aren't going to absorb that many joules, but I wouldn't go thicker than that, and, like I told John above, buy tiles with a black glaze, if possible.