First, please keep in mind you're talking to a 61-yr-old who's had four trigger release surgeries (two on right hand and two on left) in the last two years. That's why I'm rather fussy about how a set of string feel under the fingers both for fretting and plucking.
Flatwound sets with manageable tension/stiffness:
- D'A Chromes ECB84, 40-60-80-100.
- Fender 9050L/CL, 45-60-80-100 (105).
- La Bella 760FL, 43-60-82-104.
- GHS Precision Flats 3025, 45-60-75-95.
- Sadowsky Black Label Flats Light, 40-60-80-100.
Flatwound sets I find a little too stiff:
- D'A ECB81, 45-65-80-100 = 45G and 65G a little too tense.
- D'A ECB82, 50-70-85-105 = Based on ECB81, I wouldn't even dare try these.
Just my own personal experience...