That's not the antiproton proc though, just bonuses added to those particular weapons. Antiproton is supposed to have an inherent higher crit, regardless of those extra bonuses, from my understanding anyway. That's why I use antiproton heavy cannons myself.
Those are not from bonuses - all the STF weapons have the same bonuses accross energy types. None of the beam arrays have a [CridD], hence why most don't show it. However, the antiproton ones do show +20, but like all the other beam arrays don't have a [CritD] modifier. The DHCs also don't, but all DHCs have an innate +10, hence why most of the STF DHCs show +10. The antiproton ones, however, show +30 with no [CritD] modifier.