I think both of you guys already answered the question but if I could chime in I would like to.
I have used HCG both Sub Q and I.M. From the research that I have done over the years the serum levels of HCG up until about 36 hours after an intramuscular injection are significantly higher than with a Sub Q injection. Now a lot of this has to do with how obese the individual is as well. With an I.M. injection if you are not going deep enough into the muscle tissue and are still in the fatty tissue (if you are injecting in the glute) the maximum amount of HCG will not be absorbed causing a lower serum level.
It is almost like HGH imo. An I.M injection of HGH is rapidly absorbed into the bloodstream yielding optimal uptake. A Sub Q injection of HGH has a delayed onset reaction and is absorbed slower into the bloodstream. Not saying that the full uptake of HGH will not be there but I just prefer I.M. injections.
I.M. injections with both HCG and HGH. If you are that concerned use a 28g, 1/2 inch insulin pin and hit your HCG with that in your side delt that way there is not a ton of pain (minus the Bac water pain).
Just my 2 cents team.