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Yes it is accepted and code. The GFCI will only protect what is downstream though. Also as picture shows you must connect duplex to load for it to be protected. The load will be labeled on the receptacle.

This can happen if there is a loose connection, a broken wire, broken insulation, etc. The usual symptom of these types of faults is you can measure full voltage when there is no load, but devices that you plug in just don't work (or are slow or dim). This happens because the small gap in the conductor caused by the loose connection or the broken wire is ...

Since it's a Ground Fault Circuit Interrupter (GFCI) breaker, it's very likely that you have a ground fault. GFCIs work by detecting an imbalance in current between the ungrounded (hot), and grounded (neutral) conductors. This is why you only see the trip when the circuit is under load. If there is 0 current flow, the current is balanced. I'd start by ...

Yes you can certainly do this. Other options include replacing any outlet upstream with a GFCI, or replacing the breaker with a GFCI breaker. In both these cases, the entire circuit would be protected.