11 - 20 watts represents only 0.5 - 1 dB, which would virtually never be
discernible by the other station. As others have noted, even this
insignificant potential gain would be reduced by balun loss. But what no
one else has mentioned is that the ladder line loss can increase
significantly, possibly even dramatically, when it gets wet. Any
improvement you'll see from the proposed change will be due entirely to
placebo effect.

Roy Lewallen, W7EL