Try this: Use Opus 5.5 on high. When it says it's done, ask it to review the change with a sub agent and with Codex Sol 6.1 high and to fix and iterate on the reviews until both reviewers are happy or the findings are nitpicking. Each re-review should be in a fresh context. In my experience, the result of this is very good.

Since what you describe what you want matches my recent switch to working as an "engineering director" of my agents, shameless plug for my own setup (non commercial, open source): https://obeya.si.