I think it would be a good idea to throw in some isolation exercises for the muscles that don't get hit much from the one's you listed. I wouldn't recommend going to failure, most people overtrain too quickly when using high frequency and going to failure.
And as said before, a push/pull 2x per week, or full body 3-4x per week might be a bit better, though you'd need to lower the volume per muscle per day if you choose the latter.
If you're interested in high frequency splits, read up on HST and DFHT.
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