So to avoid trans plant shock in auto flower seed ...

I got 5 gallon bucket bottom 1/4 is hydrastone and I got 3-4 inch empty space at the top if it seams to much I’ll go to 3 gallon next time

I will say, in the year plus frequenting this questions page.. I’ve seen more issues with jiffy starters than any other starting method.

Sure, jiffy and this one on picture stress the plant. I would plant direct to the soil and water by the sides, so roots will spread the right way. Care not to over water, that's the biggest problem possible.

I'm not a fan of jiffy products I find they mold a lot of time. If the root mass is already getting bound before your transplant or it hasn't had a chance to decomposes, it could get stunted. I would recommend a max size of 3gal for autos to start off with. and just plant directly in it after successful germination. Good Luck!

These aren't my favorite product for starting seeds. The bottoms which remain moist do disintegrate easily, but the lip of the pot that stays drier remains very sturdy. The problem comes when you plant the pot, if the lip remains exposed it will wick water away from the bottom, and the pot stays intact too long. The solution is to either make sure the lip is buried and not exposed to air, which may mean you pot your seedlings too deep when you transplant, or, rip off the leathery lip when you go to transplant, which means you might be giving rough handling to your seedling. Because I generally choose to rip the lip off, I feel like I can be gentler with a plastic pot. If you were looking for an option like this, I think a soil blocker tool is preferable. It's a little contraption that squeezes seed starting media into a block with no wrapper. The blocks hold up well enough for planting.

Just use a root riot, or rockwool plug or some shit..

Ya remove bottom might be a idea heloo tap root penetrate but roots grow eith trought these pots as they compostable? Something to contemplate I’d hate to take bottom off and accidently prune my tap root

You will need to cut off the bottom.