Well, I gave it a try, although I'm a bit rusty with F-5E. Btw has the FM been tweaked recently? I don't recall this jet being so wobbly, unless that's what several months of fly-by-wire flying will to you...
20° dive bombing just for you:
Almost by the book. Almost, because it was another attempt and I started the roll in higher. But it's worth to notice that actual 20° dive on target was established around 6700 ft.
But overall that is also my feeling that the 5000 ft AGL recommended in the training is too low for 20° dive. Or it depends how the roll in is performed. It's possible to lose like 1000 ft just before 20° dive is established.
Just to be clear I'm not able to score a direct hit with very attempt although my bombs land inside the circle (almost) every time, provided that a dive angle of 20° (or higher) is established. But this is not a pinpoint strike jet, so I guess it's unreasonable to expect this kind of accuracy.
BTW I tweaked the training scenario, so I can start in the air (set the initial altitude in ME to your liking, after mission start adjust the reticle and fusing and you're good to go).
F-5E free fall bombs training.miz
I just checked Instant Action - Free Flight for A-10C (Caucasus). After gaining some altitude I picked up Batumi (16X) and Kobuleti (67X) from ~80nm with no problems (heading and range). I suggest you check this default mission as well.
As for the volume - did you unmute TCN switch on the intercom radio panel (with RMB)? It must be up.
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Jascha's post in Training mission--free fall bombs was marked as the answer