i totally understand. i definately try to sign as much as possible and fingerspell if i dont know something.. my only problem is my HOH friend who never shuts his mouth when hes talking to me. he is a perfectly good signer, but forgets that i can sign or just finds it easier to talk to me instead. i always sign to him to "shut your mouth, and sign please!" haha.
but my ASL teacher gave me a pair of earplugs that i usually put in when i go to deaf events to kind of help remind me to not use my voice. it actually works!