Tom -
What I use for shrimping is just like computing the price per pound for salmon!!
50# Stealth Commercial pots. (blueoceantackle.com)
350' of leaded line.
Puss and Boots catfood (fish flavor)
Gold Seal prawn bait
Copper River prawn scent
(a mixture of all of these) in Scotty bait jars - 1/8 inch holes for higher current, 1/4 inch holes for neap tides and short soak times. Sometimes both 1/4 and 1/8 jars in the same pot.
If you have a butt carcass (I keep mine in the freezer) it usually helps to drop one in the bottom of the pot.
My float size varies with the expected current, and I use an addional float on 30' tag line if expecting more than 1 knot of current.
For 1 knot + of current I use the smallest Danforth anchor ahead of the pot -- and to prevent the float from moving the pot I use a weight ahead of the pot about 10'... if the pot moves at all -- no shrimp.
I use one pot per float and line, but I THINK that if you stay close and tend your pot you can put two pots on one line. Done all the time in Canada, but the regs are not clear in the US. Many of my friends put two pots down -- I use an electric puller, and two 50# pots + shrimp + anchor could be a real grunt.
Because I can see the shrimp (pod, herd, flock, huh?) on the depth sounder, I can drop the pot up current so the pot will leave a scent trail -- and hopefully drop near the shrimp.
HTH,
Dusty (sometimes I even get shrimp)