Your comparison is a bit off, don't you think?
Regular A10s don't have AA radar nor they carry Amraams nor were designed to do so.
Su-27 on the other hand, carries and deploys ET missiles and we had real-life photos of RuAF Flankers taking off with those missiles underneath.
Reglardless of the 'unrealistic' performance they would have in Lomac, if planted under fueselage, they would still make a lot more sense on an SU27 then your Amraams planted on a Hog.:D