I don't think mode really matters and I hold that my baptism was valid as obedience to Christ's command, but I disagree with the liturgy that was spoken over my baptism and the assumption that I had no regenerative faith until my head was wet. Therefore, I will submit to baptism by immersion as a profession of my faith and as entrance into the body of Christ via the SBC.
When you say, "my baptism was valid as obedience to Christ's command", are you referring to your obediance or the minister's obedience? Is the validity of your baptism reduced because the minister's accompanying liturgy contained doctrinal error?
Is the Nicene Creed is wrong when it says, "I acknowledge one baptism for the remission of sin"? Are additional baptisms necessary to correct the baptismal deficiencies of visible churches? If so, how does your view differ from that of the Romanists and Orthodox who consider Protestant baptisms to be inferior and require a baptismal supplement prior to membership?