Thanks for the reply. Now I can try the oolongs since I know how much tea should be used.
When I initially opened the tins to check out the tea and smell it, I didn't pay much attention to the appearance of the leaves. Looking now though, I see that the Wuyi has rather large, loose leaves and so would be better with 2 tsp, to get more leaves into the pot. Similarly, the jasmine #5 leaves look much like most tins of black or green teas I have, so 1 tsp should suffice there. The oolong #8 seems to be kind of in between these two in size and the ti kuan yin looks like small, compact pieces, so I might not have been able to guess correctly on those.
Here's another question. I believe others have mentioned around here that some teas will stand up well under two infusions, in particular that some oolongs are like that and can give two brews of different flavors. Are any of these four sampler pack oolongs good for double brewing?