You are assuming that the dosage is "too low", but keep in mind that Humaworm was formulated by someone who clearly knows what he is doing, and has been doing so for years (and before that, watched his grandma help thousands of other people). All the grateful thank-yous on the Humaworm site and on this forum are testament to that. I would think the safe bet is to abide by the experience and instruction of the original formula, instead of risking a wrong move which may set you back months.
It's normal to feel the critters moving about as you are taking the Humaworm. It's because they are disturbed and running for their lives! RG used to say that one Humaworm round can only catch x amount of parasites in your body. If you have more than that, you just have to be patient and wait for subsequent rounds to kill them off. But at least, you know that even if the current round doesn't do them all in, the remaining ones will be so poisoned and so weakened that they will not be able to do much during the waiting period, particularly if you take the in-between herbs, which keeps your internal environment hostile to the critters.
Hope this helps you. As RG says so often, hang in there and stick it out!