Some precalculations:

• My weight: 79.75 kg
• With empty bucket: 80.90 kg
• Empty bucket: 1.15 kg

Bucket #1:

• With bucket: 92.55 kg
• Grapes: 11.65 kg

Bucket #2:

• With bucket: 95.05
• Grapes: 14.15 kg

Bucket #3:

• With bucket: 94.65 kg
• Grapes: 13.75 kg

Bucket #4:

• With bucket: 90.85
• Grapes: 10.4 kg

Bucket #5:

• With bucket: 91.00 kg
• Grapes: 10.55 kg

Bucket #6:

• With bucker: 89.35 kg
• Grapes: 8.9 kg

Total: 69.4 kg (or 153 lb even).

I’m going to start processing the grapes now. Will likely take a few days.