since i dont want to spend 300 games grinding the entire strike aircraft line i want to know wich of those fighters is the best for cas at rank 7

yea the A10 and F111 are the best options, id argue the A10 is blatantly overpowered but held low by how poor quality american main pilots are.
Probably the F-4E Phantom as it can carry 4 GBU-8 HOBOS, FnF cas usually is the safest and best bet for cas that high up as you will be facing tunguskas and many other SAM systems that you dont want to be in range of for very long
at rank VII? For what ground lineups you want to use them tho?
11.7 and 10.7 since the abrams are at those brs
whats the FnF?
Fire and forget.
Once you have designated the target it will head towards it to the ordinances best ability.
In the case of the HOBOS its a self guided bomb without a rocket power assist, so if you could toss a normal bomb at it, this one can reach it too.
None of the presented airplanes.
You want to get A-10A late, or grind yourself the OH-58D or Little Bird ifyou dont want to go through the attacker line.
Either F-5E or F-4E, it doesnt really matter. F-5E has better FM, F-4E can carry more ordnance. You will realistically use only Mavericks tho. Trying to use Walleyes or the other guided bombs aviable to F-4E at 11.3 is just asking for trouble.
None of those tickle my fancy so i guess ill have to play 300 matches to grind it with my premium phantom