I work with Yew quite a bit, it grows well in the heavy forest here. Depending on what you are using it for, ie. staves, some twist is acceptable and can be readily untwisted with heat and/or steam. Yew is extremely forgiving with small knots, crossing growth rings, etc. Anything else, knotty, extreme twist, etc. I always slice into 2” thick slabs and then rack and air dry for several years. They make beautiful laminations, and even riser woods. But it should preferably be harvested during dormancy. And seal the end cuts as quickly as possible, whether you are splitting staves or cutting boards.