You need to correctly time the steering arms in the steering box and set the backlash using the screws on either side of the steering box first before you hook up the draglinks. If you have the backlash adjustment screws backed way out while setting the toe-in with the draglinks your toe-in will change as the gears are forced back into mesh with the adjustment screws.
How many threads can you see at each tie rod end on the drag links? The need to be in pretty far to get the toe-in correct. Did you replace the tie rod ends? The new tie rod ends I got last year where a bit longer than the old ones and I couldn't get the threads clean enough down in the drag link tube so it would thread in far enough to correctly set the toe-in. I cut off about a quarter inch from the threaded end of the new tie rod that goes into the drag link which made it match the old one, and that was enough to get it right.