See my new post for a partial response to this portion of your argument:
Firstly, I don’t see any benefit from the proposal. I don’t think the 10% norm forms a major part of EA’s public perception, so I don’t believe tweaking it would make any difference. If anything 2%/8% makes it more weird (not least because it no longer matches the tithing norm). You haven’t made any compelling argument for the reputational advantage to be gained either here or in your previous post, yet alone that this is the most effective way of gaining reputation.
See my new post for a partial response to this portion of your argument: