I cant ride standard pedals with a double chain set due to crippling knee pain after only a few miles. With a wider Q I can knock off centuries pain free in good time. There are a few options available to you:

1, use a couple of extra washers and see how you go. Dont add more than 2 because you will lose pedal thread into crank. Who cares what make they are, they are all about 1mm thick.

2, google up "knee savers" They come in various widths and materials including stainless and Ti but they are quite big, so try the cheep ones first - I found then too big. Specialized also sell an equivilent 20mm version

3, Standard speedplay zero pedals are more adjustable in their standard form than other paedals because you dont lose the Q adjustment when you set the cleat angle like you do with most pedals - (avoid the Ti spindle they are the narrowest of any pedal out there). Good if you just need a few extra mm

4, Speedplay longer spindles - I use the half inch longer spindles myself with results as described above. I will never ride another double chainset road bike without them, they fixed me completely and instantly. I tried quater inch ones but they were not quite enough, i keep them in the tool box just in case one day i get a bike that needs them

5, get a tripple chainset/ wider BB arangement.

6, if you need new shoes then get some with slotted bolt holes that allow greater adjustment. I cant remember who makes them (Sidi?)but they are out there

If its not knee pain you are trying to cure then think long and hard before doing it and causing yourself problems. My knees can feel adjustments of mm so it doesnt take much.

Also in conjuction with Q adjustment I find that a mm or 2 of varus wedge puts the finishing touch on my comfort.

Good luck