Also from some comments, the resist drain stacking seems underrated .
Here is the mech i will use for the calculation ( i count only the average damage rounded down )
The physical defense of the opponent will be 165 ( mpv or lpv with a platinium forteress )
The mech start ( at the 3rd range )
1st turn 2nd 3rd 4th 5th
Solar torch DAA Desert fury Desert fury ~jump~
( activating ) 1 156 203
178 -60 phy resist -23 phy resist -23 phy resist
-9 phy resist + + + +
Ejection blast Spartan Spartan Spartan
307 329 376 400
-5 phy resist -15 phy resist -15 phy resist -15 phy resist
~ ~ ~ ~
Solar torch Solar torch Solar torch Solar torch
252 299 346 370
-9 phy resist -9 phy resist -9 phy resist -9 phy resist
I didn't continu because the damage inflict is enought for destroy a most of mech in arena
( 3216 damage in total )
Now let's try with a idea of buff for the desert fury from of somebody ( + 10 phy resist per hit )
( the damage changed with the buff [ 1 hit ] ) ( the damage changed with the buff [ 2 hit ] )
1st turn 2nd 3rd 4th 5th
Solar torch DAA Desert fury Desert fury ~jump~
( activating ) 1 156 213
178 -60 phy resist -23 phy resist -23 phy resist
-9 phy resist + + + +
Ejection blast Spartan Spartan Spartan
307 339 396 420
-5 phy resist -15 phy resist -15 phy resist -15 phy resist
~ ~ ~ ~
Solar torch Solar torch Solar torch Solar torch
252 309 366 390
-9 phy resist -9 phy resist -9 phy resist -9 phy resist
With the proposal buff the total damage increase by 110 ( 3326 damage in total )
But here is a build where the fight is very fast and i didn't counting if it fighted front a heat mech so the increase damage can up to 170 or 230
So it was like the desert fury have a average damage of 408 ( if we convert the buff into average damage but is can change if you fighted a heat mech, your weapon are blocked by energy mech, the fight finish in only 4/5 turn ..)
And the spartan have 388 average damage and it's heavier but have 3 use but the weight of the desert is practically 2 times lighter .. It will was so op with tye proposal buff ..
Well, i think the desert fury don't need buff but really if he had to have a buff it would be +3 resist drain, no more .
But i think the best solutions is add new long range weapon , is my opinion .