Ian,
My LPF plots are very similar to yours. Here is my current power output. I removed some turns on the 40m and 20m toroids.
160m - 6.0 W
80m - 5.3 W
60m - 4.9 W
40m - 4.9 W
30m - 4.5 W
20m - 4.6 W
17m - 2.7 W
15m - 2.4 W
12m - 2.2 W
10m - 3.7 W
6m - 3.0 W
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The only band I am disappointed in is 15 meters and the 2.4 Watts.? My LPF plot is very similar to yours, so how did you get 5.3 Watts out of that band? When I optimized the LPF for 20 meters, the power actually went down on 15 meters, but the LPF plot for 15 meters doesn't indicate the cause for the decrease in power.? But I think your 20-15 meter LPF is optimised for 15 meters as your 20 meter power is less than mine.
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As far as the procedure for modifying the toroids, I studied Hans' YouTube video on optimizing the QCX+.
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The more I understand this radio, the more I like it. I now think my radio is 100% normal.
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Steve, W2MY
Steven, W2MY