Load a working weight that you can handle for 10+ reps. Start out with your normal stance. After every rep open your stance an inch or so. Don’t go too heavy until the mechanics are second nature.
As far as your toes goes (sic): You’ll get more power pointing them straight forward but it’ll be harder on your knees. Lining them up with your knees is good advice.
If you can’t lift more weight in the wide stance than you can in the close stance it’s because your posterior chain and hip flexors aren’t up to par. This will turn around once you get used to the technique.
Also, it’s more important to sit back onto your heels and push your butt backward while keeping the spine neutral when doing the wide stance. Mostly because there is a greater tendency to fall forward, especially as the loads increase… And they will!