French to English Bus/Financial Retail

Hello everyone,

I'm looking for some help on an academic paper:

Avec une superficie moyenne de 3 403 m2, les magasins Mammouth étaient des « hypermarchés nains » qui, grâce à leur implantation en zone urbaine, avaient un positionnement de magasin de proximité, d’où le poids prépondérant de l’alimentation (70% des ventes), en particulier les produits frais.

My try for now (I want to understant le poids préponderant before I possibly re-write the sentence):

With a surface average of 3,403 m2, the Mammoth stores were "dwarfed hypermarkets", which, through their presence in urban areas, had positioning to the local convenience store "which mostly sold food" (70% sales), particularly fresh produce.

Any feedback would be greatly appreciated.

Mary