I have almost the same problem and I attribute it to the converter.
I run 7.16 @ 98.92 in the 1/8th but only run the 1/4 in 11.12 at 117.
I have a 4K stall on it and I think it is slipping WAY too much at the top.
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306DSS, AOD, T-Trim Vortech
#3325 w/ driver
6.9882@100.33 1/8th
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