In terms of energy management you could have save a lot of speed even before the merge. From 4 mins until the merge at 5 mins you were making somewhat tight turns back and forth (I think to keep an eye on the spit while trying to drag him out away from the base?) These turns are bleeding your speed off even before you've engaged the spit. Each time you turn you stopped gaining speed or even lost a little. If you wanted to drag the spit away from the base while keeping an eye on him then you should have done 1 very shallow turn, either left or right, and keep him in you 5 or 7 oclock position. This way you can keep an eye on him, drag him away from base, and you continue to gain speed in a very shallow turn.
A few times I think you could have made slightly more separation from the spit as he came in for a shot. 8:14 and 8:46 are two good examples. You did avoid the shot but it was just barely. At 8:14 I would have rolled right as soon as I saw him rolling left to drop in on me and fly to his 6. This would have denied him any shot at all rather than giving him a possible, but rather difficult, shot. Same thing happens at 8:46 as well. Spit rolls left for a shot, I would have rolled a little more right and flown to his 6.
A couple times it looks like you're trying too hard to get a shot on him. You're making a turn into him with pure or lead pursuit to try and line up a shot when you should be flying to his 6 with lag pursuit to gain a better position. Some examples of this are:
6:41 - I'm not too familiar with how the 110C handles at low speeds, but if you could have stayed vertical just a second longer here then you would have save just a tiny bit more altitude and drop down into a better position on the spits 6.
7:27-7:35 - A little questionable on the placement of your lift vector. Flying to his 6 with lag pursuit would have gained you a better position more towards his 6. Still, nothing bad about what you did here as you do gain the spits 6 in the very next move.
8:00-8:06 - Again, you get a little to eager to line up a shot and turn in too soon. Turning in too soon without being in a good position for the shot means you don't get one. This also puts you in a bad position where the spit rolls over and gets a shot opportunity on you. Had you been a little more patient and flown for his 6 by staying vertical just a little longer then you would have gained better positioning and the spit wouldn't have gotten that shot opportunity.
8:34 - A little too eager to get the shot again, and the exact same situation as 8:00 happens again.
9:30-9:50 - The start of this was very well flown by you. Nice use of flaps to help get behind the spit and keeping enough speed to still maneuver. It's the second half (9:45) where things go a little south. In that situation what I would have done is keep some or all my flaps out and pull straight up into the vertical to get above the spit. As the spit passes below me then I use my rudder and swing my nose right and into him. My rudder and gravity will wing me over and give me a snapshot on him. I do this all the time in planes with decent rudders. Not sure how good the 110C's rudder is so I'm not 100% sure this move would work but it's just what I would have done. What you did, roll into the spit, wasn't really a bad move as you did gain his 6 after you rolled out of it and the spit could not roll over the top for a shot like he did twice before, but now the Spit has gained the altitude advantage and you do stall out trying to climb to him in the next move.
10:50 - I would have dropped lower through the "egg" and gotten right on the deck (I would have gone lower but there is the ground that's in the way

). This would have created slightly more angles to work with and slightly better positioning to avoid the shot.
Overall you fought very well for being in a plane that was completely outclassed by a Spit8. The few missed shots at the start really did you in as the very few mistakes you made added up and the spit finally started to use his superior climb rate to work you out of speed and altitude.