I can't answer your question but I understand where you are coming from. There are tons of different soil recipes out there for blueberries. The peat should help with the acidity. I incorporated Holly-tone soil acidifier into mine the last time but I did not add leaf mulch. I think I used 3 parts pine bark fines to 1 part peat if I remember correctly. They are growing well.

Thank you! I was hoping someone would reply. How deeply did you amend the soil? Did you have a time period between amending the soil and planting?

I grow my bbs in 5-1-1 medium (5 parts COMPOSTED pine bark mulch, 1 part peat moss, 1 part perlite) and add a handful of elemental or soil sulfur. After planting, I mulch with pine bark mulch. Yes, 4-6" is too shallow, in my experience they have reached 18" but I read articles that recommends amending 24" x 24" to be safe.

Have you considered growing in a raised bed or mound rather than amending the soil? Depending on the variety that you're growing, an 8" to 12" deep bed filled with a pine bark fines or bark/peat blend should work well. While adding some of the leaf compost would probably be fine, I'd make it a small percentage since the pH will likely be higher than is ideal for blueberries.

All acidifiers are fairly sow acting. if you are not going to soil test, I would dig rather deeply (10 inches to 1 foot+) and replace the whole volume with pine bark mulch and peat [i]and[/i] start with sulfur or holy-tone.

Acidic material won't do the heavy lifting you need to acidify soil. Organic material no matter how acidic originally, by the time it is fully composted it ends up pretty neutral.