each year is different but normally the crabbing picks up through June and is good July-October, eventually the rain pushes the crabs down to the ocean and the good crabbing is limited to the ocean or very close to it...from ocean to Florence Launch, the river is basically: jaws, A4-A6-A7 bouys, Crabbing dock on south side, Coast Guard station, Rhody drive rock wall, Red marker Wing Dams (line of wood pilings with a Red channel marker on the tall end one), Dunes, 101 bridge, Old Town/Marina/Launch, 29 marker (just up from the launch where the river turns and N.Fork comes in)....you will have all these locations figured out real quick once you get crabbing and especially if you do any chinook fishing this fall.
with your boat, I would be careful to not get caught down near the ocean (past the CG station) on a day when the tide is working against you and the wind is coming up over about 10mph. the normal NW wind will actually help you heading back to the launch but a strong outgoing tide would make having a problem with your outboard a pain. Do you have an electric trolling motor? (might not get you back to the launch against the tide but safely to shore if your main dies) Marine walkie talkie is a great thing to have also, I just consider that a must have so I can hear CG updates on conditions and communicate with them (or other boats) if needed.
I have not heard any recent crabbing reports but early-June, I would still be crabbing down low, just OFF the CG station is a great stretch, also down from the Crabbing dock to the green A7 bouy. most the good areas are around 20' of water, some down to 30'...by July we would expect good crabbing all along the long stretch where the Red wing dams are, between the wing dams and also across the river. Most years this is a great area from July through September, crabbing near the 101 bridge and OFF Old Town Florence is usually decent those months also but it varies year-to-year and normally, you are going to get more big keepers down lower in the river but is usually isn't necessary to go much lower then the CG station to get into good crabs...
for any sort of crab trap or pot, I like to get 30 minutes soak minimum, longer better unless the river is just full of crab. Rings need to be checked more often and one or two of these can be helpful to test areas quickly before giving a trap a long soak...
PM me if you have questions about specific locations or anything else...cheers, roger