I hope the line is working out for you. The front taper on that line is gradual, at least 35' long, the line is around 75' total.
If you don't routinely cast sinktips with the full 75' head outside the rod's tip top, my advice would be cut and loop at 20'. It'll turn over tips better w/o noticeably changing how the line feels on the rod.
The story is different if you routinely cast with the entire head outside the rod - then cut at 15' only to avoid removing grains from the line.
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