GruttePier, for what it's worth, the following is this traders way of looking at this messy business...
If a trader is truly picking quality entries, price should be getting to +1R well more than 50% of the time. If this is not happening, then the trader is no better at picking entries than flipping a coin and needs to work on reading the market better. If this is happening, then the trader has a winning strategy in hand by simply taking profit at 1R on their first contract, no questions asked. This is the place to start. They can then add contracts in order to catch the runners. If price is not getting to 1R more than 50% it is unlikely it is getting to other milestones like 2R or 3R enough to be profitable either. This is where your spreadsheet is so valuable in giving you clues as to the quality of your trading.
When trading multiple contracts, the trader should be able to isolate and evaluate the results of each contract as if it were its own trade. If each contract is not contributing positive results to the bottom line, what is the point if even putting it on? The first contract should be profitable by itself, the second contract should be more profitable, the third contract even more profitable, and so on. Therefore trade one contract as if it were the first contract in a multiple contract trade. If a trader cant be profitable with one contract, even just a little bit, they are unlikely to be profitable with multiple contracts.
You may have a winning strategy right now. It doesn't seem right that you should be taking losses after price has moved 1R or more.