Have you ever thought of using Sainsburys on Winterstoke Road. You can use "Just Park" app and i think its about £6 to park there on match days. I use it when i am on nights if i have to shoot straight off after an evening game.
Certainly a lot cheaper mate and not that much of a walk. Plenty of Pelican Crossings to get across Winterstoke road also. Maybe worth looking into.