I have very alkaline former seabed sandy soil here in CA. I amended it with just chicken manure and mulch on top and not the hole. Popped a 1g grimal seedling in and it's happy as a clam. I think they are one of the most adaptable cultivars of jabo, especially regarding PH, and you may be overthinking your planting. I recommend against amending soil so much, and especially the use of peat as it can become hydrophobic over time.
At most I amend the hole with 50% foreign material. Lately I've just been digging into the sandy soil, plopping the plant in, and dressing manure up top. Works a treat.
Others in FL may chime in with more experience, just expressing how it's been for me here. I have been genuinely blown away by how fast it's growing.