AFAIK, It is impossible to have an "aqueous" solution of HgCl2, hence it's name "corrosive sublimate". It doesn't exist as a liquid.
HgCl2 is in fact water soluable, so it is possible to have an aqueous solution of it.
that is indeed how swim stores HgCl2 he has made.
notice i said aqueous HgCl2, not liquid HgCl2.
i would also agree that the problem more likely lies with your amalgamation procedure then with your HgCl2.