Screamers reign supreme because of their instant deshielding. Especially in bombers, where the main part of the battle is fighting someone's shield so you can instantly nuke them with a snac.
If you aren't experienced in using mines then naturally the hit ratio is very low. Most of the bomber aces can easily land one out of two combined with CDs, they are very hard to avoid generally if someone experienced is using them.
They are fine as they are. The fact that it does 100% damage to snub shields makes it the ideal choice compared to the nuke's 90%, along with making you survive longer as it doesn't do hull damage.
The bomber's only damaging weapon that's sensible to use against snubs is the snac, and the two harmonize perfectly.
