| Congratulations on your purchase. I strongly commend your fine taste and judgement!!
In this vein, I have used D'Addario medium half rounds on my fretless P-Bass for the last 28 years. (the same set -- but have 2 more sets for back up for an emergency)
Sound is great for jazz - small and large bands. But I also used it in pop, blues, rock, show bands and C&W. (I worked with it as my only bass for many years)
You might be happy with pressure wound or brite flats, of which I have tried 2 different gauges of each. I liked the half rounds better, and would try them (or medium light) as your second or third set when you are more certain that what you have used isn't what you want.
I have LaBella flats - Jamerson set - 52-110 on a fretted P-bass. Thud. Dark. Great tone but I like more articulation on the fretless.
I don't like tape wounds on anything. A lot of finger drag, large diameter string.
IIRC they were expensive 30 years ago--when I last tried them.
I had been experimenting with the sound of this fretless bass for 6 months before I heard Jaco (March 1st, 1976). I am not a follower of his tone nor directly his style.
For reference, on URB I use Correlli mediums, for favored tone, tension and response. | 
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