When I saw the H69S, PIXIE3, and XS arms combo, I thought you were piloting the old Danger Halley design by ArcadiaH69S, but then I saw the RJ legs... those took some serious skills to use. 
Might I suggest this build? I do not have my PS2 handy to test it, but you could give it a whirl to see how you feel:
CR-H69S (Tune 70% cooling, 30% energy defence)
CR-C90U3 (Tune 60% weight, 10% cooling, 30% energy defence)
CR-A92XS (Tune 40% cooling, 30% shell defence, 30% energy defence)
LR04-GAZELLE (Tune 30% weight, 10% cooling, 30% shell defence, 30% max weight)
CR-B83TP (Tune 100% booster heat)
CR-F73H
G02-MAGNOLIA (Tune 70% weight, 30% output)
ANANDA (Tune 70% drain, 30% cooling)
HOHSHI
CR-E81AM
CR-WB85RA3
-
WR07M-PIXIE3
WL08PU-ARGOS
WH11PU-PERYTON
CR-WH01HP
Optional parts: O01-AMINO, CR-O69ES, CR-O69SS, CR-O79L+, O03-CODON, O04-GOLGI, MARISHI
The main changes here are the part tunings, the new legs, and lighter weapons. The first impression I have with the original design is that it has a ton of ammo, which would be overkill in most 1vs1 situations, not to mention not being able to pour all that lead into the opponent before the ECM runs out (Granted, I could be wrong since Nine Ball is not that durable). I tinkered with the tunes to get a little more out of the diminishing returns, and swapped the legs for a slightly higher defence, AP, and stability.
I am not sure as to what optional parts you have equipped originally, but they should not make that much of a difference.
Cheers, and welcome to the boards!
Edit: Changed WL11PU-PERYTON to WH11PU-PERYTON as it is available to both hands.
Might I suggest this build? I do not have my PS2 handy to test it, but you could give it a whirl to see how you feel:
CR-H69S (Tune 70% cooling, 30% energy defence)
CR-C90U3 (Tune 60% weight, 10% cooling, 30% energy defence)
CR-A92XS (Tune 40% cooling, 30% shell defence, 30% energy defence)
LR04-GAZELLE (Tune 30% weight, 10% cooling, 30% shell defence, 30% max weight)
CR-B83TP (Tune 100% booster heat)
CR-F73H
G02-MAGNOLIA (Tune 70% weight, 30% output)
ANANDA (Tune 70% drain, 30% cooling)
HOHSHI
CR-E81AM
CR-WB85RA3
-
WR07M-PIXIE3
WL08PU-ARGOS
WH11PU-PERYTON
CR-WH01HP
Optional parts: O01-AMINO, CR-O69ES, CR-O69SS, CR-O79L+, O03-CODON, O04-GOLGI, MARISHI
The main changes here are the part tunings, the new legs, and lighter weapons. The first impression I have with the original design is that it has a ton of ammo, which would be overkill in most 1vs1 situations, not to mention not being able to pour all that lead into the opponent before the ECM runs out (Granted, I could be wrong since Nine Ball is not that durable). I tinkered with the tunes to get a little more out of the diminishing returns, and swapped the legs for a slightly higher defence, AP, and stability.
I am not sure as to what optional parts you have equipped originally, but they should not make that much of a difference.
Cheers, and welcome to the boards!
Edit: Changed WL11PU-PERYTON to WH11PU-PERYTON as it is available to both hands.
