Thats interesting, it was to the best of my knowledge 2,500 pounds for a hanger, but HT did say at some point that he was going to adjust it higher if he fixed the Killogram/pound equilvancy issue, so if the 2,700 pound adjustment was indead made than I gues he did so, howeaver in the CT we still almost always use 2,500 pounds for hanger's It has also been my experance that each 5 inch US rocket had a 100 pound equilvancy, but it could well be the higher figure you sight, howeaver if this is so then I think the P38 is overload at max load, I know for a fact that the P47 caryes more ordance than it should.
All that aside the Question of Which is the Best Jabo is kinda to a degree a mater of taste, depending on what you want to do with it. When I was score whoing around the MA fro my first couple years in AH, imo the P38 was the best Atack plane...
Why: It caried it's ordance very easly climbed better than the P47 and handeled much better, pluss it had an Hispano. For a Rank atack sortie, I would Kill one hanger, in one dive two 1K bombs were droped followed by 5 rockets into the target, then I pulled out and used the 5 remaing rockets on a field object or two, then I entered Vulch mode and typicaly 12 kills was easly acheavable with the ammo load.
The P38 did all the much better than the P47 did, although the P47 had more potential destructive power it was not nearly as handy in the doing of it.
The only other contender is the Me 110G, which after the Adaption of the Killorgam/Pound equilvancy fix was now competative, howeaver the P38 still has the advantage if the Hanger hardness is in fact 2,700 pounds, espichaly if the rockets are higher than 100pounds. The cannons are very lethal on the Me 110, but having to use them aganst ground targets is not the best use for them, killing is, and hear you see the differance between the P38 and the 110.
The C-hog is another Killer Atack platform, it's quartet of Hisppanos and the huge ammo load for them are a formadable combo, but the P38 does the same thing easer, in terms of carying the ordance to target, and it caryes more weight in ordance than the C-hog,but those cannos are deadly thats for shure, magore killing can be done with them aganst everything, Planes, GV's ect...
But this is all as I said a matter of tast, since I use atack planes or would in a MA type seting for a rank sortie, if your looking at it from a shear potiental distructive effect then I beleave the best atack plane is the JU 88.