Make sure you have a consistent "release" on the TM. You can easily be +/- 1 division from sloppy technique.
If a "release" doesn't feel right, remeasure.

If it were me, I'd back off all the spokes so the first thread is flush with the end of the nipple.
Then tighten in consistent increments.

Many of us just get the NDS spokes slightly snug and then concentrate on bringing the DS up to about 90% desired tension.
1/2 turns, then 1/4 then 1/8 as tension increases. KEEP IT EVEN!
Then tighten NDS spokes to get proper dish.
Recheck DS tension and add a bit if needed.

36 spokes would be a better choice for your weight.
Mashing is tough on spokes. Remember, you are trying to "unwind" 1/2 of them whenever you pedal.