Jeff,
I have an Upton Hawkes hybrid, and it's a great bass all things considered. It is strung with a set of Spirocore mittel (medium tension) strings on the A, D, and G. However I am using a Spirocore stark (heavy tension) E string, which I would recommend highly on that bass. The Spiro stark is very strong and powerful (stark literally means strong).
-bob
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