Give it 4-6 weeks of loading phase. You will smash PRs again pain free.

Heel elevation masks the issue but doesn't fix the root. Work on heavy loaded calf stretches between sets.

Isolate the tendons with heavy slow resistance. Spanish squats or slow tempo leg extensions do absolute wonders.

Yes! An upper/lower split allows you to hit target groups with massive density twice a week.

Do not worry about losing your strength base. A bigger muscle has a much higher potential for neurological strength output anyway.

Exactly, otherwise the texture goes weird.

Most isolates mix well. Concentrates can get clumpy.

Unflavored for me. I mix it with fruit.

Magnesium before bed helps with the leg cramps.

Don't forget hydration. Electrolytes are huge.