[TowerTalk] Changing Air Variables in an Antenna Tuner?

[kd4e]

I have a Dentron MT-3000A-clone MFJ-984 tuner.

I'd like to improve performance on 80 & 160M
QRO and read of one Ham changing the C1 240pf
input series cap to 750pf and C2 114pf to 675pf.

While I expect that would work well wouldn't
I lose most usefulness on 20 and up?

Can someone recommend a good middle-ground
set of values?

The current caps are 9" L, 2.75" W 2.75" H.

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Thanks! & 73, doc, KD4E
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