Five filters in , and having actual filters to judge, I can absolutely confirm the flange is the area responsible. After trying several methods of mitigating the heat the extension of the shield backwards will be effective for a short time but the end result will be a hardening of the silicone and eventual splitting of the base of the actual element from the inlet neck. But from looking at your piece if the inner surface of the shield were lined with 1/4" Heatshield Products Header Armor it would shut down the issue of filter melt.
That said, I could use a discount on a front mount for my R and D efforts
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