After hitting 40, I retired my entire party, and replaced them with clones for the bonus SP, except for the Medic/Runemaster, whom I replaced with an arcanist/medic, and I'm still not sure if that was the best of ideas, now that the party as a whole is back up to lv 30. Arcanists bring plenty to the table via their binds, but as a medic replacement, they aren't as effective as I had hoped.
The passive heal on the circle is fairly low, so using the dismissal heal is fairly important if you want to make use of an arcanist as a healer. However, that's a one turn setup regardless, so I can see things going sour for me pretty quickly if it comes to a boss fight. Off course, I can also fill that hole with the dancer's healing step, so perhaps its not THAT big of an issue.
The bigger issue though, is simply the lack of out of combat healing. Bracing walk maxes out at 10hp per step, and that's simply too much of a SP investment for something that's only really worthwhile with a warding bell. Yes, I can place points into the Medic's sub-tree healing skills, but it seems to be a fairly inefficient use of both TP and SP.
For people that have went down the same road, how is the arcanist/medic fairing in the 4th stratum and beyond? How is the TP management working out if you are using the refresh skills and straight heals semi-regularly on-top of the arcanist circles and debuffs?