I ended up adding two more columns to my logbook, one for SIC as a LCA (that I'll probably count as PIC for application purposes) and LCA not counted as Total Time (for jump seat time as LCP). These are separate from Instructor time, which I already have a column for. Probably more complicated that it needs to be, but I'm a nerd when it comes to stuff like this, so the more info in there, the better, and I can explain it during an interview and calculate it however they would want to see it.