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It should idle before it's warmed up. If it doesn't, it's too lean. That could be the idle screw out too far, or the carb gaskets leaking, which would also explain the hissing sound. Does the choke close all the way? If not, that would also explain a lean mixture leading to hard starting.
Since you put in new jets a year ago, some crud in the fuel may have gotten past the filters and obstructed the jets. The idle jet is the narrowest, and when that is even partially clogged she won't idle. Run a thin wire from a wire brush around in the jet to clear it. If you want to make sure there is nothing in it, you will have to carefully remove it with the right size screwdriver, and hold it up to the light.
From what I understand, turning the distributor clockwise retards the timing, which richens the mixture, too much can foul the plugs. When you get it running, turn the distributor at cruising speed under load and see what setting gets you the most rpm.
I have heard that having the idle mixture screw 1 turn out from the seat is often enough. Turning it out leans the mixture. If you have an adjustable main jet, turning it out richens the mixture.
IMO, it's better to keep learning about the simple engine you have, than to start over with a new outboard. All engines are dependable until they aren't.
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