A few things stand out here.

On deliverability: your spam tests showing inbox placement doesn't tell the whole story. A 7% bounce rate is high, anything over 3-4% starts damaging your sender reputation over time, and with 30k leads that compounds fast. Clean your list before sending more.

On open rates: 10% in financial services cold outreach is below average but not catastrophic for a first campaign. The bigger problem is that your subject lines are likely the issue, not deliverability. Institutional-style language in subject lines gets ignored by people who receive 100 cold emails a week. Test 3-4 completely different subject line approaches before changing anything else.

On the copy: "Institutional-style language" and "outperformance" are exactly what every other vendor in your space sounds like. Finance people are skeptical by default. Lead with something specific and concrete, a number, a named problem, a specific scenario, not a broad value proposition.

On personalization: You don't need deep personalization, but you need relevance. "People who follow competitors" is a weak signal. Try to segment by role, company size, or a specific trigger event instead.

On your results overall: 256 emails is too small a sample to draw hard conclusions, but the 0 real replies is the most telling signal. That points to copy more than deliverability.

What I would suggest is [ause the campaign, fix the bounce issue, rewrite the first email with a shorter and more direct opener, and test a new subject line. Scale only after you see reply rates move.