vair68robert - a general thought.
Changing any value would subvert Jim's expertise. Thiel controls drivers over a 7-octave span rather than the few octaves required for fast slopes. Board space and wiring density are real issues in revisiting an existing design. My layout strategy is quite different from Jim's - it requires considerably more footprint. Also, the wiring nodes are replaced by direct coupling of each component output to its mating component input. Duramax is alluding to replacing Thiel's signature 1uF styrene/tin bypass with a newly designed multi-section 1uF cap. In its ultimate form it would be all copper, but the particulars of its multi-section ratios is the key improvement. The larger number of smaller value caps also makes its own performance enhancements.
Cheers from the rabbit hole.