Firstly flushing fresh soil doesn't get rid of any nutrients, flushing soil only works like that when you've been feeding with chemical ferts and there's a build up of salts. If you want to make soil less hot mix it with perlite or some other inert medium.
Just start seeds straight in wet coco, no need to feed the first few days just water then start with low nutes after a week gradually raising the amount as the plant gets bigger. I water every other day when the roots are developing but every day after that.
You're probably right about the soil, all I know is with FFOF I started them w/out doing anything to the soil one time and they basically didn't grow right, and I remember reading something on here about how it is too hot for seedlings. So I began flushing it a bit in a beer cup and they grew perfect.
@ The End Is Near: I plan to use the Canna A&B, I think they recommend you use their PK13/14 during flowering, I will have to run some tests and see for myself.
So far I have been told I can use rockwool cubes, rapidrooters, or just plant the seed directly in the coco (similar to my soil method). Do any of these methods require I use the paper towel method until the taproot shows and then plant it into the medium? I really hate the paper towel method... I always had a lot of slow growing plants when I did that, I believe it'd because you can damage the taproot when taking it from the towel to the medium.
Love to hear what anyone else does, some good ideas so far, I might try planting directly in the coco AND rapidrooters just to see what I like best.