I have a strike rate of about 50%.

50% of the time I know the horses name that I have money on, 50% of the time I don't.
Mechanical is the only way for me. I don't have the patience for doing form of any kind on a consistant basis.
I am going alright at the moment, but will never be 100% confident in what I am doing. There are just too many things that can change. But I believe that is the case with anything involving money. Very few people have a 100% guarantee of consistant wages, whether employed or seeking other financial ventures.
I am happy to ride the wave while it lasts, and realise that I will have to monitor and adapt. I don't believe in throwing away a once profitable system and starting again. Things change, we need to adapt.