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Will DS-40 make a better job of removing scale than X400? Will my 8 year old system survive it?

The system is 8 years old. I gave the system a good flushing through 2 weeks ago with boiler off, pump on full, constant drain from the bottom of the boiler for 2 hours in an attempt to flush the crap out. I assume the crap is baked onto the inside of the boiler. Last year X200 didn't cure it...

Definitely kettling and not air. Does it with bypass wide open or closed. No overflow into tank. Pump is on outlet of the boiler.

My boiler is kettling, worse during warm-up than when up to temp. I cleaned the system with Sentinal X400 last year. The kettling died away after about 10 days. I flushed the system out afterwards, added X100, but the kettling started again almost immediately! Checked today and I have black...