FA is your best friend in this match-up. When Abel puts you into a CoD string, you can tap out(not-so clever way of saying mash) a lv1 FA after the first hit to score a counter hit crumple. It doesn’t matter if he goes for mid or low for the second hit, he’ll lose to FA every time. His only option is to stop the string/FADC while you get a Lv1 FA and dash, so it’s entirely in your favor. [edit]I don’t know if this works vs. the super armor on his EX CoD. I don’t have the time to check now, try it out!
When he knocks you down and goes for a cross-up j.MK, absorb that with FA and back dash out of it. Treat him like a grappler, and take him being in close range very seriously. His normals and mix-up game is good up close, so you don’t want to be there. Fortunately it’s not very difficult to keep him out with Rose. Be careful with fireballs at mid-range, it’s asking for doom as he can just roll in and punish. If he rolls at you for any other reason, really… don’t let him get away with that, lol. Be on the look out for stuff like cr.HK cancelled to roll. His mediums are all relatively good openings to CoD, be aware of his f+MK into dash command normal. Back dash after blocking this because he will dash in and cr.lk pressure ticks/tornado throw. His regular goofy kicks have such long start-up you can slide under those and punish him on reaction.
What exactly is Rufus doing that you’re having troubles with? Unfortunately I don’t play this match-up nearly enough to fully understand it… so I’m interested. I can start with a couple of things:
Obviously his character design is to RTSD. You can stop repeated dive kicks with a simple cr.lp(vs. TK dive kick) cr.hp or ex soul throw(vs. dive kicks that start up high), but he beats all of these with an EX messiah kick. If you just sit there and try to bait out the messiah kick he gains momentum from mix-ups which is really in his favor. EX Messiah kick is his goto “get off me” special, and it’s so good. Because of this, you generally can bait one out, and If you do manage that is good because you can get a lv2 FA after all three of his options(you can’t Ultra, because a reversal will beat two of his options, but lose to his overhead follow-up. If you wait and don’t reversal you beat his overhead but lose to his low follow-up – At least I’m pretty sure thats how this works, any insight would be nice), so he can only FADC out of it, and forcing him to burn 2 meters is really good.
Going forward air to air with him is in his favor, snake strikes really hurts, and Ultra juggle is even worse. However, neutral j.HP vs. anything he does is really nice. It beats his dive kicks and I think all of his other specials on the ground clean. He really can’t touch this outside of the tail end of EX messiah kick, but that’s a trade. This normal, even on neutral has a tendency to cross his fat ass hitbox up if one of his specials whiffs under you. It only takes one j.HP to knock him down and get out of the corner.
Rose vs Sim is really awkward. At least the way I play Rose, I am comfortable everywhere on the screen and Sim completely takes her out of that. One thing I have found very effective vs. Sim is horizontally reflecting his fireballs. Rose 101 is reflect his fb, he can’t follow up with his limbs as he likes to do in every other match-up… but there have been many times when I have reflected his fb and he tries to follow it up with a normal and he ends up getting knocked down. I really don’t know what this is, I should bring it into training mode but I haven’t been thinking about it recently. One time I reflected his fireball and he went to the air to attack, his limb hit the horizontally reflected fb and he got knocked down(his model was covered in flames so it definitely hit), but the fb remained on the screen and actually meatied him for my jump-in! 
Of course you don’t want to reflect every fb that comes your way, but it’s definitely an interesting tool to consider. Especially if it scores you a knock down.
Slide is good for closing distance when he goes to the air. Stay on your toes with every single teleport he makes, and if he pops up in front of you (without meter) you can Lv2 FA. I’m really interested in some discussion on these two relatively obscure characters.