Sometimes it happens that after eating that there is a boost of the medicine, and not only when taking mushrooms, with other Entheogenics as well. But it doesn’t mean that it will always happen. We are glad you were able to handle the experience!
Taking a smaller might be the best for you as you are still trying to find the right dose for you.
For splitting a capsule, you can simple open it, and mix half of the contain with water, natural juice or warm (not hot) tea and drink it.
I hope this helps!