I need help with using the Leopard 1 in 8.0 and also grinding for an 8.0 CAS plane

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they are fine.

not happening with 2kg of TNT

oh alr

Being HEAT they might just disappear with 0 damage, but overall the missiles are good.

Well there are plenty of lightly armored vehicles around so yes, but they are also generally very agile so they might dodge you.

will the slower speed make it more vulnerable to SPAA?

You can easily dodge while shooting and staying around 2-3km away from the SPAA. While their guns aren’t very accurate at all at that range they’ll still get lucky shots on you.
In my experience your worst enemies are PGZ09s because of how common they are, they don’t need a direct hit and they have no tracers, M247 is even more dangerous but people don’t use it very much.
If you are very unlucky you can also run into SAMs, all you can do against them is keep your distance and hope they can’t lock you.

what about the threat of jets, can i stay alive from enemy jets?

You get 4 machine guns, they are not very strong but they are enough to take enemy planes down.

ok thanks