[old_tv_nut]

You can't do it with the high wattage components, but if it were lower power, simultaneous adjustment with both a capacitor decade box and a resistor decade box could make short work of a problem like this.

This has been deprecated in the past as "dec-box engineering" because there is no pre-calculation of the correct values. But it need not be looked down on if two things are true:
1) You already have a reasonable starting point
2) You are observant enough to understand which aspect of performance is changing as you make the adjustment.

In a hypothetical example, you might note that a small resistor change modifies overall width (and is it larger or smaller) without much change in edge compression, while the cap affects both width and compression, and adjust first the cap in a small step to get better edges, then the resistor in a compensating small step to get the right width, and so on.

NOTE: you also have to be aware whether the transient condition of an open circuit while switching the dec box could cause a destructive fault. In your case, you already know nothing is being destroyed even with the components open-circuited.