This is incredibly variable. Right off the bat: When looking at this number you are increasing it a fair bit between having the phone on, which runs Android, as well as System Panel itself.
You also need to run and close System Panel several times, and watch the number for over a minute to get any kind of useful number.
I have good battery life, and plenty of times I have seen it do exactly as you mention, refusing to go below 700. Other times it will go down to around 400. Other times 550, etc. etc.
Long story short: Ignore it. Completely.
As to the OP: Don't hold your breath. They also mentioned a patch to "fix" bump and off charging, among other things. It is just typical PR: "Huh? You have a problem? Oh, yea...we're workin' on it. Hang in there, and keep sending money our way! kthxbai!"
Sure, I wouldn't be surprised if there is a patch on the way, but don't expect it to be to "fix major froyo problems" ( Unless it forces a factory reset. ) So far, almost every single "major froyo problem" has been a specific user issue ( Not saying the user did anything wrong. Just that it is user apps misbehaving and needing reinstall/reset ) or a sort of one off ( theres been a few issues such as the blown earpiece. Known issue, appears to be tied to a possible factory defect that just didn't come into play/show itself in 2.1 ) and even at least 1 where there isn't a problem to begin with ( slow charge times. The charge time after Froyo is exactly what the charge time is supposed to be, listed in the manual and on your cable...Eclair was actually charging way too fast and causing problems. So they brought the charge time down to the correct time, thus fixing a bug. )
Also, the Flash update to 10.1.92.2 will probably be in the market in not too long, and that seems to fix a lot of lag issues.