Hey BJC,
I would say this is fine. I recently read about a user "Ronnie" on the boards here who felt nothing until he upped to four and then it was lights out
You are your own best judge of how you feel / your body. Err on the side of caution, like you are and you'll be fine.
Go ahead bro, and please let us know how it went.
Much Love,
Neoborn