As long as I continue to consider ALL the money in my account mine the longer I will continue to struggle with increased lot size and adding to losers.
You should never "add" to a losing trade.
You can scale into a trade amidst the protection of a stop, but you should never just let a trade wander aimlessly past a pivot while you hope for the best (you don't have to move your stop when you scale into a trade).
Because your stop must move in closer, after adding size to a full position, the decision to add size is the same as the decision to trail a stop loss.
Maybe price stalls and you think that you should move your stop up close below a recent low pivot.
Knowing that a decision to move your stop is a decision to add size, and vise versa, you should ask "can I bring myself to add size here" and if the answer is "no" then you should just get out as your unwillingness to push that little button has shown you what you really believe.