Why don't you stop after wait .6 sec delay.
This is what i've done on console sorry i don't play on PC, just helping:
combo Double_Pump {
set_val(PS4_R1, 100); //can switch this to key 2
wait(560); // IF SWITCHING TO(PUMP) SET 570 ELSE TO 410 FOR (TACT/ HEAVY)
set_val(PS4_R2, 100);
set_val(PS4_L1, 100); //can switch this to key 3
wait(560); // IF SWITCHING TO(PUMP) SET 570 ELSE TO 410 FOR (TACT/ HEAVY)
set_val(PS4_R2, 100);
}//end
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.5 sec delay is TOO low, the weapon wont shoot swith that to .7 and make your way down.