Have you tried adjusting the feed rate?
Just thinking, you have a series of blobs there. Is that because you can't sustain a longer arc or because you are welding in short bursts?
You'd be better off laying down a few more beads on a flatish section and getting the feed rate right. You should, when welding, be able to identify a "pool" of molten material into which the wire is dipping as it feeds from the torch. Look at that is happening to the wire relative to the pool.
If the wire is "stabbing" into this area giving a series of loud cracks and lots of sparks, the wire is feeding a little fast. If it hits the metal, an arc forms and then the wire end retreats quickly back into the torch and has a tendency to extinguish the arc or weld itself to the nozzle, the feed is too slow.
If you get a soft hum, no spattering or cracking sounds, a continuous arc and the wire is hovering above the pool, you are nearly there but a little slow still. The wire feed is keeping up with the arc and you are trying to do spray transfer. What you want is to feed a little quicker so the wire dips into the pool and retracts over and over again with the "fried egg" sound accompanying it.
Once you've got to that stage, having a decent, constant arc will give you more heat than you are currently getting, I recon.
The next thing you want to practice is to watch the pool and where the wire is dipping into it and move the pool along the course of your desired weld. Easier done on a single flat piece of scrap to start with, before moving on to something like that exhaust, IMHO.