I have found your chair is the key.
Chair must have arm rests to raise and lower.
Chair must also be raised and lowered, often.
Flexible back on that chair too. The seat needs to be large enough to shift your butt from side to side often.
Anyone using a steno chair with out the above
features, is surely going to have problems.
No I do not sell chairs, just know from suffering the pain. LOL

Dare To Deviate