I'll just confirm just about everything everyone else said
- seemed more like 1000 grit than 4000 grit. It took me weeks literally of fine sanding and polishing to get just smooth. It wouldn't take a polish. Storm's Xtra Shine was the compound that had the most effect on that coverstock.
- I tried pin over center of bridge which is about 75 x 5.5 x 40 for me. That sucker still flared almost 5". It was obscene. Needed almost true medium oil to perform and then it just arced lazily.
I think you can use as small a VAL angle to increase response and as large a Drill angle to promote length. Use a long pin-CG to reduce flare or even a flare reducing weigh thole. The stock RG differential on that core is very large (.055" ??) I think it's an inappropriate core for a urethane.
I gave up and sold it. Hope you have better luck with it.
"None are so blind as those who will not see."