can't help you with location but trolling seems to be the way to go.
troll whear you think they are, or look for the birds. five or six white turns offshore is a good indication of tuna under them. if there's shearwaters there too? even better. cast at them if you can, but don't run too close to them, they spook very easy. troll arround the school and cast in the middle with small stuff. but if you overrun them don't blast up another 100' just mosey over there if you keep the same rpm's they will stay up.the ones we saw yesterday under the birds were 20#, so super-light approach would be the way to go.
for trolling i would put your two 30# outfits with green machines back about 40 feet and put your spinning rod and a small jet head about eight feet behind the boat rubber banded to a cleat so it's in the wash.
i'd save a few of those eels to toss into the blitz too
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