I haven't worn specialized shoes in years, but when I did I found them too ducky, tips pointed up, too much, made me walk like a duck. So long ago I can't imagine they still make them that way. If they do, and you walk heel to toe, with the cleat in the forward most position I imagine there isn't much to be done for it, cept buy new shoes. eggers, Time cleats have a lower profile than SPD, it'd be worse for you thataway.

They all the way forward for fit or just to avoid toe overlap? Nothing to be done for fit, but toe overlap is best dealt with by learning it IMO. My feet aren't huge-like, just a size 10-10 1/2, but I'm a small guy so they're big on me, I always have a bit of overlap.

to the OP;

Used pedals, used cleat, used shoes & spd to boot? You ought to consider having a brake on that bike, 2 if you haven't mastered the front brake yet. Learning fixed & clipless at the same time, sure, but in a grassy field, or a parking lot if rash for no reason is cool with you, no traffic though. velodrome would be the ideal place for learning both at once, at least for the spectators