I used corn sugar on these, and I did it by weight, about 4 oz for both, put a tad bit more in the pale because we wanted it a little more fizzy, probably about 4.3 oz or so.
Boiled it up and poured it in the bottling bucket, then let excess siphon hose make a circle thing at the bottom so that when the siphon went it would swirl the mixture by itself without disturbing it to much and mixing air in.
I kept the bottle in the mid 70's for about 8 days, sampled every few days to determine when they were carbonated to what I wanted them to be, then moved them to the low 60's.
Also keep in mind, CO2 absorbs better into liquid at lower temps, so I think the reason mine was so different between when I put them into the low 60's temp was from it being in a colder enviroment and more co2 was absorbed instead of vented out when the lid was popped, just my theory though...
I am still a novice, but I wouldn't recommend putting sugar in each individual bottle, that sounds scary...