A balance cap cannot be the screw that we adjust as long as the vote weight is combined balance+magnitude.
jringo posted https://steemit.com/gridcoin/@jringo/a-brief-overview-of-vote-weight and from that you get that 1 Mag is worth 5.67 GRC in vote weight. I don't know how this number came up. For me the average between 70:30 and 90:10 is 80:20 but this is how today's vote weight is made up.
To get the power over polls away from whales we should be putting more weight into the magnitude. This way more voting power gets into the hands of boinc crunchers.
An important factor here is: GRC is inflationary, Magnitude is not. This means the vote weight ration GRC:Mag needs to be adjusted every once in a while either way.
I think we need a fresh poll for the vote weight. Maybe the 50:50 option gets more votes from the crunchers this time.