Question about web 2.0's

If you followed Googles 'Mantras' you would be WHITEHAT.

This means NO LINK BUILDING.

Your Web 2.0s are in violation of googles 'rules'.

As far as how to post Articles to your Web 2.0s, if a manual reviewer checks your ten Web 2.0 links with a magnifying glass, maybe it potentially could mean something.

But the Algo will not pick all ten up at once or register the Articles. The extra caution has no real need or concern.

Would it hurt to stagger the posts? I would not say so, random is better in my opinion. But it is extra work with no real benefit. Google is not an all seeing biblical entity. It is a series of computer programs. Nothing more, nothing less.

recently i have built 20 over web 2.0s in 2 days, notice some serp increase from position #8 to #5
start dripping blogposts from pbn as tier 2 to my web 2.0s

In web 2.0 thee is many things you can do to make it as natural as possible, this will give you the best effect from it,
Generally make it random.
Post some articles without your link.
Get some times images or videos inside the post.
And personal advice don't build just 10 build hundreds of top quality web 2.0s if you can

That is 10 newly created web 2.0s blog, you will have problem indexing it if you just leave it, let alone getting penalized.

Just build all of them at once man, you are overthinking too much.

I wouldn't get in the habit of not drip feeding links. Link velocity does make up for a natural looking profile. On to your question - even if you do post, they will nto index at the same time for sure, some of those take longer to index.