I'm concerned that my seeding these altered files is 'harming' the pool somehow
It 100% is. STOP DOING THIS. You are NOT seeding the original files. You are 100% poisoning the swarm. You WILL get banned, and it will be your own fault.
If it's too late to change candidates, why hasn't the DNC convention taken place?
Who, exactly, would be an ideal candidate at this point to replace Biden that has a hope in hell of winning? Who, exactly, has the national recognition to pull that off in the Democrat party, or really any other party, in November of this year?