Your first Echelon is pretty well set (Anti-Rain is always a sound formation), personally I would swap UMP9 for M16 assuming you have an armour plate for her as she is an DPS off-tank with the same skill as UMP9. Note: this only works when using M4A1 due to her special buff tiles.
The rest of your echelons are a bit haphazard here are my recommendations. With what you have i would do the following
Echelon 2: 3AR/2SMG
G41 has excellent DPS while FAL's quick firing triple grenade can clear a good number of enemies with any left overs being cleaned up by 416's grenade
Echelon 3: 2RF/2HG/1AR
This is a balanced all purpose echelon that can efficiently deal with both armoured and un-armoured enemies. ZAS's fast firing, large radius de-buff grenade provides support to your RF's while also helping deal with un-armoured enemies during night battles.
Realistically you don't need more than 3 echelons for combat at the moment. Since you seem to be a relatively new player based off the levels of your dolls you should not be focusing on a MG/SG/HG echelon due to their high resource consumption but if you insist on using one the best you can make is:
SAA Mk23 Elphet
This formation actually does more damage than an echelon with 3MG's would while being cheaper to run
With what you have left you can't really make any effective echelons and realistically if you have unlocked 5 echelons at least two of them should be permanently running logistics missions for resources.
I hope this helped and I apologise if i was a bit long winded in what i wrote