Anyone else losing deals purely because scoping takes too long?

I've been analyzing our sales pipeline and noticed a brutal pattern. When we turn around a detailed Scope of Work (SOW) within 24 hours of a discovery call, our close rate is nearly 70%. If it takes us 4+ days because our dev team is swamped and has to manually estimate features, that close rate drops to under 20%. Clients lose momentum fast. How are you guys speeding up the architectural breakdown without risking under-scoping?