which 3 or 4 relays should I query to know what are your preferred servers? how can I possibly know which relays did you post your list on?

wouldn't that by default force us all to post and read from the same 3/4 relays to have reliable resolution? wouldn't that make them target? and what happen when they censor you or go offline? where do I go to find you now?

if you try to solve this, you will end up reinventing DHTs, but you have ZERO chance of making a DHT even 1% of the size of Mainline.

So your options are:

1. use Mainline DHT

2. make a worse more vulnerable version of Mainline DHT and use that instead.