I'm in a similar situation... I applied this past cycle with 3.21 BCPM, 3.54 overall, 31 MCAT. I graduated last December, but I'm planning to go back to school over the summer and take 4 upper division bio classes. Assuming I get A's in them, my stats would go up to 3.34 sci, 3.61 overall.
Is this enough to make a difference to the adcoms? If i send an update letter with this info, will they actually recalculate my gpa? I had planned on working in the fall, hopefully at a hospital/ medical office, but would you recommend I take more classes instead?