Few Problems - Discoloration, Weak Stem, Burning?

I appear to be having some problems, are these normal?

All my other seedlings appear to be doing great.

SkyWalker OG - Stem Bending and discoloration!
If it weren't for the toothpick, seedling will be completely laying on ground
Been going on a few days

& Discoloration



L.A Conf. - Discoloration



OG Kush - Burnt?
There was that brown/burnt area, I tried to gently wipe off but just created a hole

Mostly time to up pot.

Forgot to add - that stretchy one above .... Carefully transplant her and bury that long stem , it will shoot roots from it.

Prepare their final containers - no feed just a simple cup flip and transplant.
If they are watered already than just leave them alone in new pot ... Let them become settled in ( couple days. )

New pot mix will carry plant for time so letting the new plant " explore " it's new home , it will begin more accelerated root growth. Few days give a light watering - roots will head to bottom to search out more moisture .... Then continue on as usual.

Some noobs will transplant ( shock ) new seedling and DROWN IT IN THE NEW POT.
So not HOVERING over your plants is the best advice I can give .... Overdoing shit will cause you more harm . Wait til you get a couple node spaces in and then start introducing VEG FEED as she moves from early veg into MAIN VEG . You got time to eventually bump the feed as needed.

A good tip :

Once leaf spans across the top of your solo cups then it's time transplant.

Really? Transplant already?
In tutorials I see, generally the plant is twice the size of mine.
And a rule of thumb, I was looking for little roots popping out of the cup underneath

As for the transplant:
I haven't watered for 1.5 days, transplanting dry is better or do I water and set first?
Also, it feels like the stem isn't strong enough to flip over (maybe its just me), and the dirt feels like it will spill all over if I flip the cup.

Thanks!