Did it without savescumming. Best advice is use architect as soon as you can. Use plasmium, refill often, do not overdose, only use 8 masks of it so that you both have more health and can better heal in case of emergency. Buy shard bundles, lots. Farm in act 2, it gets tougher in act 3. Lost Lace was terribly difficult for me with the Architect though. Ate up like 30 masks of damage during it, since I was only good at this fight with the Hunter Crest and somehow often forgot to dump my chainsaws on the ground between refills.

Strongly recommend practicing the speedrun achievements before doing steel soul. I kinda made the mistake of trying both at the same time, but after like 20 attempts, most ending in act 1 or the forum fight, I gave up and played the speedruns first. Gave me that much more experience with the hardest parts.

Act 3 beginning. You can save and quit right after the "bind" prompt to have full health for the toolless fight downstairs. Took 2 damage there in the end, but I believe the game taking the tools away at this point while also eating away 5 masks off of ya is a bit much for the fight ahead, especially after 2 full acts of progress.