If your sled darts a lot, this may very well be the reason.
First I square the handle bars up by measuring to a known point on the back of the sled, such as the center of the flap. This gives true alignment of the handle bars. Then I put a drywall square on the track (any long straight edge will work) and extend it out beyond the front of the skis on both sides. Often this gives me one ski that is not straight.
Once I find the ski that is mis-aligned, I crank in or out til the wear bar is exactly straight, with neither toe in or out. I wiggle the handle bars a bit and check a second or third time.
While I think that it is better to have toe out than in, neither one helps with darting. Since I have been doin this on my Polaris and cat sleds, it reduces darting to a minimum.
I leave the nut on the inside of the strut loose and only tighten the outer nut to prevent the tie-rod from moving. Then it is pretty easy to adjust if some dummy hits something and knocks it out of alignment again.