Oh I don't deny that the Owens is definitely a better mech, but the SSRMs are easy to dodge when moving laterally to the target, the speed difference is only a large factor in chasing. The Owens B has limited torso twist so is at a disadvantage in a circle of death and the few SSRMs that do connect can easily be spread all around the Osiris while the lasers and SRMs can be aimed, all one has to do is leg the Owens and the battle is instantly over, where as the SSRMs do not home in on the legs of the Osiris so you have to core it. Its the nature of the SSRMs at the moment that are the problem there.
I didn't say it was easy but it is possible to force the Owens B into a disadvantage.
The hardest part is hitting the legs enough time to leg it before it runs away to its buddies, as the piss poor damage of the lasers complicates things and it takes alot of practice to hit legs with SRMS.
Here is what needs to happen: Bring the armor on the Raven down and the Osiris armor up and have them meet in the middle, or a bit above that, neither should have as much armor as the Owens does. Next the Osiris Prime needs its full 5 Medium Lasers, from the heat performance I can tell you it will handle it fine with its current heatsink set up. If we want to try the canon 5 ERMBL we will have to try it with DHS, if it still runs too hot to use then stick with MBL.