Probably (don't know the exact arrangement you have) keep using the thumb for the bottom three strings in cases where one of those strings is played on the first or third beat in the measure as that will help with a more even sound. On an off beat you can substitute your index for the thumb on one of the lower strings (probably for this piece just talking about the fourth string, say in an arpeggio). This and a wee bit longer thumbnail may help you avoid bumping adjacent strings
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Derek Coombs
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Guitars by Mark Blanchard, Albert&Mueller, Paul Woolson, Collings, Composite Acoustics, and Derek Coombs
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