Cold Email Deliverability Expert - Lift Outlook Placement to 60% +

UK B2B facilities-management company running cold outreach on Salesforge: 19 mailboxes across 4 domains, ~4 months warmed, 25 sends/day each, currently on shared infrastructure. Outlook inbox placement is stuck at ~25% — my prospect list is Microsoft/Outlook-heavy, so Outlook is the whole game. I've previously held 75%, so I know it's achievable; something's degraded, most likely the shared infra reputation. My copy converts and my domains are warmed — I don't need a rebuild, I need someone to diagnose the cap and fix it. SUCCESS METRIC: Verified ≥60% Outlook inbox placement, sustained for 2 weeks. Payment is tied to hitting it. SCOPE: Diagnose why Outlook placement is capped on an already-warmed setup Advise on and execute migration from shared to dedicated sending infrastructure if that's the cause (I'm on Salesforge — Infraforge / dedicated-infra experience a big plus) Kill deliverability-killers: open tracking, link/image issues in content Verify SPF, DKIM and DMARC are correctly aligned across all 4 domains Check domain/IP reputation and blacklists Scrub/verify the prospect list to protect sender reputation Run before/after inbox-placement tests (GlockApps or equivalent) with evidence WHAT I'LL PROVIDE: Access to Salesforge, domains/DNS, current copy and prospect list. DELIVERABLES: Working setup at ≥60% verified Outlook inbox placement, before/after test evidence, and a short SOP so my team can run day-to-day sending afterwards. PLEASE ANSWER IN YOUR PROPOSAL (I'm filtering on these): Single biggest cause of low Outlook placement on an already-warmed setup, in your experience? Shared vs dedicated infra — how do you diagnose it, and is it likely my cap? Have you worked with Salesforge / Mailforge / Infraforge? What realistic Outlook inbox rate can I expect, and how do you measure and hold it? Show a before/after where you lifted Outlook placement — numbers if you've got them.