First off - temp - you can't successfully keep discus under 82 F. so don't even think about keeping it any lower.
As Axelrodi said, you can't keep 2, (or even 3, 4, or 5 discus) without having aggression/pecking order problems big time. (Hey, they're Cichlids !)
In a 95 gal tank, with what you have now, WITHOUT ADDING ANYTHING ELSE, you may be allright with 6 to 8 discus.
For sure, don't add any more Otos, and keep an eye on what you now have - they have been known to take a liking to discus' slime coats as part of their diet - I know - It's happened to me ! Same thing for SAE's.
And do yourself a favor - don't add anymore Amanos, or anything else - at least for now.
Discus are not hard to keep - you just have to appreciate they are intolerant of sub-standard water conditions, and you just need you to follow a few simple "rules" to keep them successfully.
If you're serious about discus, it may help you to have a read of my Discus Guide in the simplydiscus.com forum - here's the link:
One thing you don't want to do, is to lose beautiful, but expensive, fish.
If I can be of any help at any time, please don't hesitate to PM me.
BTW, a 300 gal discus tank would be awesome !