on the whole, I think
1. delete both Soult and Romana
2. Remove the Leader of Honour Special Rule
3. move Mortier to the French Centre
4. Delete the Spanish leader with the Heavy Cavalry. The Allied cavalry performed poorly. This leaves the Spanish with one leader, and the French 2 leaders, which seems not ahistorical.
Something to note is that the artillery in the castle loses 1 die firing out. Historically there was a gap between the fort and the Spanish Right wing, so removing this artillery, and moving the Spanish Line unit into the fort would achieve this, and be better for the Spanish in my view.
An interesting aside on the Spanish commander Mendizábal;
He was named commander of the Army of the Left and suffered a defeat at the Battle of the Gebora after which he was kept from command. Humiliated, Mendizábal begged to serve as a simple rank and file soldier, a request that was granted. After distinguishing himself at the Battle of Albuera in May 1811, he was reinstated with the title of Commander of the Seventh Army or Séptimo Exército, which he took to the north of Spain in the territories that make up the Basque Provinces (Biscay), Navarre, La Rioja, Burgos, and Santander. He fought in this mountainous region using guerrilla tactics.
en.wikipedia.org/wiki/Gabriel_Mendiz%C3%A1bal_Yraeta