Hi Nikk
More of the same from Steve and Malcolm.
I would dive with you without hesitation, you have been, at worst, unlucky, at best, a stand up and quality diver.
Qualifications don't always mean that much - a BSAC advanced diver with 50 dives has bearly done the required dives for the grade and does not have the experience to be realy considered "advanced". Equally, you can get a PADI OW who makes you want to do a buoyancy course when you get home as you feel so embarassed.
Don't let this get to you, re-read the first half dozen replies to your post, they all still apply.
James