I fulley support and endorse joining a BSAC club and developing your UK diveing and I am not a BSAC member and have never done a BSAC course
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As far as dry suit is concerned if your comfortable and can recover from and inversion thats all you need to know. I personaly would strongly recommend using wide flange fittings on your dry suit and BCD / wing in order to facilitate a quick disconect of the inflation hose in the event of a free flow but apart from that you apear to have dry suits sussed. You did better than me I took at least 20 to feel happy
AOW is a licence to dive any where in the world and therefore well worth doing. The deep section takes you to narcosis depth and demonstrates the efects which is well worth it, the rest of the course is crap. However dont underestimate it's importance. In Gozo if your not AOW you can not dive without an instructor, in Egypt to do most liveaboard trips you need to be AOW or equivilent. Its a good investment for Blue water diving. just as BSAC is a good investment for green water diving.
ATB
Mark Chase