Dick
You could certainly scale the pectic enzyme up to 5 tsp for 5
gallons - it wouldn't hurt anything. On the other hand, since enzymes
are not "used up" in the chemical reactions they encourage, you could
get by with just one tsp. But it would probably take longer to break
down the pectins. If you are adding the pectic enzyme during the
initial fermentation, the timing should not matter much - the enzymes
will have weeks to work, which I would think should be plenty.

Doug