If I were you, I would add a Nov15 priority deadline - something similar to Warwick but in the US. Since you’ve taken ALevel Maths and already have an A*, you can apply for Econometrics at a State Flagship where you can still apply to the Honors College.
(I would replace BC, ND, and CMU with Northwestern - they like Math-y kids- and that state Flagship.)
At UIUC definitely try to add a quantitative major to EVS or EVPolicy, or a minor (you’ll get in but will probably hear back well past Jan1.) Did you complete the supplement for CHP? If not, you have till dec1. Not sure whether one applies to James Scholars (LAS Honors), contact their director?