Thanks for the tips.
1) I only took out 3 bottles from the storage room to taste after 2 weeks - they went straight to the frig for 12 hours before pouring.
2) By nice head I mean I poured down the side of a frozen pilsner glass at a 45 degree angle and only lifted at the end - there was about 1/2 inch head and bubbles on the side. By flat I mean no bubbles on the side of the glass after I drank some of it (5 minutes).
Don't get me wrong, I like the taste so far, but I was wondering if my home brewing can keep carbonation longer: did I really not give it enough time, did I run out of sugar using the carb-drops, did I ferment to hot or carbonate too hot?
Again, thanks for the temp & time tips. I'll try those on my next batch.