That's just a quick sample. Nothing I saw is screaming "I'm too large" at me. The largest header size was 32,215 when requesting GET /js/FusionCharts/Charts/FusionCharts.js HTTP/1.1.
The real way to look at this would be to try and replicate the failing environment. But we would need to know the version of ISA, patch level, and ideally, a packet capture on that side at client and server level.