anna - I'm not sure... the fact that it seems to be dropping seems like a concern... but on the other hand your B cell IgG is pretty high.
serum only do paternal - and only if they really think you need it - I guess the obvious thing to do is to try and ask Dr T, or serum if you are with them? Yes, they only do paternal, but that's because they say that paternal is more effective in helping you stay pg (assuming you were using DH's sperm). I would have thought having just the 1 shot wouldn't be a bad idea rather than 2 shots - it is just a booster you'd be aiming for, I guess.