4x4 base for a 6x6 post?

I've been "commissioned" by my parents to build a pergola/patio cover on a 12' x 16' concrete slab. At the time the slab was poured, they were advised to put down Simpson 4x4 post bases. IMHO, 4x4 posts are small for this size pergola, so I made a Sketchup model with 6x6 posts to show them. They like it. All is well there. But...
pergola.jpg
My dad took a grinder to the far-corner (relative to the house) post bases and filed them into oblivion a while ago! He left the two bases next to the house in tact. Why? No idea! The two remaining bases were put into the slab too deep, only about 1/16" of the 1" standoff portion is above the slab level.

Option 1: Use the two existing post bases. What would be the best way to cut two parallel slots in the 6x6 posts (picture)? Circular saw followed by some hand sawing to square up the slot?
post.jpg
Option 2: Use new 6x6 post base and 5/8" concrete anchors. This requires the grinder to cut away the base vertical tabs. The standoff plate needs to be drilled through for the anchor bolt and filed down flush to the concrete slab.

I'm leaning toward #2. More work, but will place the posts off the ground, out of contact with standing water (if there is any).

What you think?

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4x4 base for a 6x6 post?