So, your shoes don’t hurt and your feet don’t get numb, or hot but they feel heavy. I don’t suppose you weighed them for a reference point. Lighter shoes and heavier pedals are still grams of weight.
I think you should spend money on a good pair of shoes, but as a new rider with 125 miles under your belt, you might want to check out some shoes and keep putting miles on the ones you have. Then when you go to an LBS you will have a better idea of what you want.
It is also possible that the selection and inventory at the stores may be down right now.
John