My advice is slightly different. You keep excellent records Maurice, so I'd use them, and take a step back for a short period and do a bit of analysis. It may be your missing one or two simple tricks to get back on track. Maybe a few more, but you can definitely figure it out. I've done the same in the past and it makes a difference.
Analysis, selecting, and betting is no different to anything else, you can easily slip into bad habits and not realise you're in them. Also things change and you have to change with them.
I'd also add that the challenge of analysing, drawing conclusions, and making the necessary changes can be real eye opener, and can be quite therapeutic.
Oh yes, and I'd definitely sort your strategy out with the multiples. Slim is spot on with that. A big win every so often does wonders for the bank balance.