The yellow birch aspect is up to you but if your woods need thinning badly, don't open 3 sides all at once. Too much removed all at the same thinning exposes the remaining trees to too much wind and windthrow is an issue. A more common name is up-rooting or blow downs. You will do best by opening 1 or 2 sides this year and after the trees respond in a few years open the 3rd, Normally you would open even slower to reduce epicormic branching (sprouting from dormant branch buds in the bark). This degrades a sawlog, but more leaves make more sugar so as a syrup producer we actually like it. The windthrow aspect is a real threat. Removing too much competition at one time exposes the remaining trees to more wind. These trees need time to develop the root structure to hold against the new wind. A tree grown in the open develops a wider root structure that one grown in a grove with "buddies" for protection. As you open the woods for better crown developement you must also give the root structure time to grow into it's new, bigger job. If you are in a relatively protected area I'd wait about 5 years, if you are in a wind prone area I'd wait 10 years before doing the next stage of opening the woods.
Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.