I suppose it usually goes like this, when you need lesmok gatling you should probably turn your long range side to the enemy instead. Only when the enemy is really getting close to you, you would have to turn to the gat/mortar side and in this range the mortar beats the flak.
With a certain amount of piloting and engineering you shouldn't have too much trouble keeping the close range side to the enemy.
That only applies, if you have both, long range and close range sides though, which many Junker pilots do advice.
In general, and on most maps, that's the way to go. I run asymmetry when I need the range more open maps like dunes and water hazard.
But, on the other hand, I think there is something to be said for being able to react very quickly with the wide turn arcs, fast rotation speed either side in constricting maps like canyon ambush, where the junker's fast acceleration make it a very responsive vessel. IMO symmetrical mortars give up too much because of their lack of range.
Basically, I'm trading side specialization for a "jack of medium-close range". There's many more options available, maneuvering wise in the thick of things. In turn, it makes it simpler to position and punish vessels that are not as nimble in that odd border of medium-long range.
Still, there's the problem of having a reactionary style instead of a proactive playstyle. I.E. you have to bank on and cause your opponent to make a mistake, but I think that's an issue more inherent to the junker itself.
Perhaps more disabling power would promote that. I could look into banshees as a replacement for the flak.
hmmm.