When Will I Know my Final Size? Lift With Augmentation and Small Reduction.

I'm sorry to hear of your recovery but simple math will tell you that an augmentation that exceeds the volume of reduction will result in a larger volume (aka bigger breast).   You should be discussing your concerns with your surgeon and better understand the logic behind the decisions.  Did you select your implant size or did you leave this up to your surgeon?  Now that its 'water under the bridge', you can either resolve this with your surgeon or get a second opinion with your surgeon's consultation/notes available for review by whomever you select for your second opinion.

Something is here that I don't understand. If you wanted to be smaller and perkier, why not just a lift. 

It is not likely that you will wind up smaller if 80 to 100 grams was removed and 250 cc added. That should account for about a cup size increase in size, not a decrease. 

You may or may not have any swelling, but I don't see how you can wind up smaller than you were with 150-170 cc net enlargement. Discuss with your surgeon. All the best.