You meant H89F right? Just curious why you're using this instead of, say, S2 or COUGAR2 or DINGO. You don't have any energy weapons so there really isn't much needed for the super low drain that the 89F provides.
Nothing wrong with the rest of the frame parts, but you may want to consider GIBBON instead of MACAQUE to balance the defense a bit more.
Definitely just G91 for this one. Can't really go wrong with G91+V2+ANANDA.
Weapons: Personally, I don't really like the GAST because it's somewhat inaccurate and it gives you a special-type reticle.
R2+R3 is probably the more efficient/accurate combo, but if you really don't mind the double-special lockbox of double-GAST, and you're getting good accuracy from it, then it's fine. The hangered weapons are great and SATYROS+RM3 is top tier.
I dunno what your OPs are, but I suggest Amino, ES, SS, LA, L+, Codon, Marishi, Ribose if it can still fit
Tuning: Invest everything on defense. Don't bother tuning for cooling or weight in this case. Play around and see which tunes give you the most defense per tuning point. I think 89F pretty much needs 3 points on cooling though.
Tune G91 either (0,10,0) or (0,8,2). Ananda: (0,0,10). Vulture2: (0,5,0,5) or (0,0,5,5) or (0,3,4,3) or something like these.
EDIT:
Tested the design. I'm okay with the double special box. Like I said, if you're okay with it, then there's no problem there. 89F's not my kind of leg, but I can't see anything glaringly wrong with it either. The above-average defense stability is nice too. And... well that's it. Nothing here that really needs changing if you're comfortable with it.
Nothing wrong with the rest of the frame parts, but you may want to consider GIBBON instead of MACAQUE to balance the defense a bit more.
Definitely just G91 for this one. Can't really go wrong with G91+V2+ANANDA.
Weapons: Personally, I don't really like the GAST because it's somewhat inaccurate and it gives you a special-type reticle.

I dunno what your OPs are, but I suggest Amino, ES, SS, LA, L+, Codon, Marishi, Ribose if it can still fit
Tuning: Invest everything on defense. Don't bother tuning for cooling or weight in this case. Play around and see which tunes give you the most defense per tuning point. I think 89F pretty much needs 3 points on cooling though.
Tune G91 either (0,10,0) or (0,8,2). Ananda: (0,0,10). Vulture2: (0,5,0,5) or (0,0,5,5) or (0,3,4,3) or something like these.
EDIT:
Tested the design. I'm okay with the double special box. Like I said, if you're okay with it, then there's no problem there. 89F's not my kind of leg, but I can't see anything glaringly wrong with it either. The above-average defense stability is nice too. And... well that's it. Nothing here that really needs changing if you're comfortable with it.