Question About Grid Trading

This is kind of a long shot question, but I have been thinking about it all day and figured I would ask here in hopes that someone experienced in grid trading can provide some insight.

I have been looking at several grid threads and systems and have noticed that while many are profitable they seem to be missing something that keeps them from reaching their full potential and I see many times people give up on them.

My question is: If I know for a fact that price is going to move a certain amount from a point, lets say 20, is there a grid that can capitalize on this expected move? Lets say I know for an ABSOLUTE fact for example, GBP/JPY will move 30 pips from price X within 12 hours. Will this increase profitability of grid EAs? Will this reduce the fear from martingale Grids? or are there better strategies.

My reasoning for thinking that I have an edge for knowing the exact point where price will make a certain X amount Pip move is that with many grids there is a fear of not knowing how much price will actually move from the point where we start the grid and in what time period. I know this is especially true for martingale EAs. I'm wondering if the added knowledge of where price will make a certain X Pip move and the time frame in which it will complete that move (less than 12 hours) will be profitable for grids.

If the theoretical answer is yes, I would of course further explain how I know the point at which price will make this move. Or maybe the answer is no and Im an idiot.

I use a form of grid trading to keep me in continuing trends. Thing is, there is on absolute way to know a trend will continue so I let price tell me.

e.g. Say I see a long set-up and enter at 5000 with a 100 SL at 4900. At the same time I enter a new buy order at 5100, with a SL at 5000. If price goes to 5100, the order is triggered, SK at 5000. I immediately move the SL on the first trade to 5000. Now Trade 1 is at b/e, Trade 2 has a risk of 100, which is no greater than I originally allowed for for so my account is not subject to any additional risk from the second trade. But I also enter an order for a 3rd trade at 5200, with SL at 5100.

If price goes to 5200, Trade 3 opens with SL at 5100. I also move my SL on Trades 1 and 2 to 5100. Just keep doing this until the trend collapses and all your trades are closed. Only the last will be a loser, the one before will b/e and all previous trades will be winners. But your capital risk has never increased. And you never had to know whether the trend looked good or not, you just let the market tell you.