I use spirocore lower strings on my Upton, And I enjoy them (classical playing). at first, they were very bright, but they have now calmed down a bit. I have a personal preference for using brighter strings on the bottom to help with low range definition, so they suit me just fine, and in terms of bowing i have no difficulty, and i don't consider myself to have the most fantastic of bow arms.
just my $0.02
alex
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