I like it. Perhaps we could do it for or with Hugh on Thurs. at the nat'l. convention in addition to Holly Springs. I will look at the music more carefully later, but it seems solid after a cursory glance. I would recommend pitching it down a third to D major; the only potential problem if you do that is the low A in the first 2 notes of the counter/alto, and they should be able to reach it.
I like the symmetrical introductions to the major sections (Help me to sing..., And when I...), which you maintain throughout. A possibility that would help with the arms-harm rhyme but interrupt the other symmetry would be to move the current v. 4 up to 3 and rewrite v. 3 as a final reference to the hereafter:
Help me to sing my master's grace, until I see him face to face.
Then he will raise me with his arm. His grace will save me from all harm.
I'm not sure whether or not you want such a reference in your hymn. In any case, it would be an alternative and maybe or maybe not an improvement.
Randy