As far as taking cuts safely & cleanly there may be some issues here. I find that many root aphids produce gals in their life cycle and I may have spotted the beginings of some gals on some leaves. The topic of gals has not come up so far in this thread but I'm not so certain it's not an issue. I will be inspecting all tissues on my cuttings for any abnormalities and discarding anything that does not look 100% disease & pest free including burns bumps lumps or any misshaped plant structures.
Try the Bayer product that spleebale recommends, it's the one I used and with similar strength and it seems to be working for me so far albeit a bit early to be certain.
man... the merit (imidachlorpid aka imid) is not nuclear - i believe its the safest, most responsible way to deal with them and not hurt the enviro.