Advice on FFOF and seedlings.

Ive been reading where starting a seedling in straight FFOF can burn it as its got a decent amount of nutes in it. Can i help lessen this chance by doing a 2/3 ffof and 1/3 perilite mix? Also before adding the seed, will flushing the soil really good help by draining out some of the nutes?

Dont flush the soil, just add something to it like you said some perlite. No use in getting rid of perfectly good nutes. Plus as you go you'll be periodically flushing those nutes out anyways.

Yes it can burn seedlings if u drop it in and leave it there. Water your soil without the seed, check the pH and adjust your water accordingly. Plant your seed and you should be golden