Hi Dines, Truth there there is not that much out there, in the retail world, about trade execution-mechanics that provides ready made actionable information. As you have probably seen there is a lot of TA stuff out there and some vague stuff about risk management and ditto for psychology. Probably I would look at the archives here on ET as there is some stuff. A lot of it is well trodden ground that will save you time by not going down those paths. A lot of it was written about the same time as Douglas's book.
Also you see there are a lot of opinions out there too. I would contend it really makes a difference on the entry premises, the instrument's pattern and rhythm, and the overall trading tactics. Some people want to have fewer larger gains, so they will take on risk in a different manner than some people that want many smaller gains. Both have merits, WITHIN their paradigm. You might find one method works for some premises and suck for others and visa versa.
Sorry I cannot be more helpful. Stick with it and do the experiments. One thing I can say, is have a set of measurements of what makes something good or bad and benchmark all your methods against them. Sometimes things look good and turn out bad and visa versa.