Hi Daryn,
You are doing good work on your analysis to figure out the best workflow that works for you. I have been through a similar effort in determining my workflow. We all need to determine our own workflows as what works for me may not work for you. So, keep up the good work.
Note: I also use the premium data to generate my strategies. I then use my broker account with as much historical data possible to further evaluate the strategies just like you are doing.
My one recommendation would be to do your workflow on just one account. The problem with using several accounts is they all use different servers so the historical data will be somewhat different between all these servers and can influence your workflow analysis results which can cause confusion. Once you have determined your workflow download the historical data from a different demo account and see how it work with that different account.
Note: I generate strategies for each of my trading accounts by using the historical data from each account.
Alan,