Shopify sync overwrites the titles you fix in Merchant Center. Feed Title Optimizer rewrites Shopping titles into a CSV ready for supplemental feed — free audit of 10 titles, then a $49 pack up to 500 SKU.
Built this after watching Shopify→GMC sync wipe manual title fixes. Storefront title and Shopping title are different jobs. Free audit of 10: paste titles, get CSV. Honest ask: does this solve a pain you already have, or still missing attributes?