Lamy Question(s)

Greetings!

As a beginner, I come with a question... or three!

About a month ago, I wanted to try out fountain pens. After looking through YouTube for good beginner pens, I purchased my first, a Lamy Safari with an extra fine nib. It wrote well on printer paper and my Leuchtturm until the blue cartridge it came with ran out of ink. Shortly afterwards, I purchased a converter and a bottle of Lamy ink: petrol. Immediately, I noticed the ink flow was very different. Where the original blue ink wrote in a thin line, the petrol flows heavily, almost bleeding through both papers. After more YouTube research, I tried to close up the tines on the nib. It worked a little bit better. I decided that I just needed to learn how to write with a fountain pen, writing only on one side of the paper due to ghosting.

Curious about the differences, I ordered a Lamy All-Star, this time with a fine nib. (this will be my last purchase until I figure things out) It came in the mail today. I also purchased a converter to put in Lamy blue black ink. After filling the pen with the blue black ink, I started to write to see what it looked like. I had an even more difficult time with flow! As soon as I touch the nib to the printer paper, it flows. I can't hold it in one place for any amount of time now. I tried my Leuchtturm, to the same effect: blotting, bleed-through, and ghosting.

Because I am new to this, I decided to use all Lamy products so I know how everything is supposed to perform. This experience leads me to a couple of questions:

1. Is there a difference with the Lamy's bottled ink as opposed to their cartridges? My experience so far is that the bottled ink writes much wetter!

2. I have read that Lamy nibs can be hit or miss. Is this true? Would buying new nibs help at all?

3. Other than this beginner trying to push the tines together to reduce ink flow, is there anything to be done about the heavy ink-flow?