alright, so here's that critique you demanded, good sir ^-^
1) try using more b6 and 2A (or even 3B if you're agressive) to try to poke him out of crap like 44B.
2) u gotta deal with his step a little bit better. try throwing out 6A if you really need to catch it. (i saw you throwing out 4K against his step man!!!! grr!!!)
3) use alot more poke oriented moves like 3K, K, 1K, b6, 2A, ect. to hit him out of attacking at disadvantage. you can't let him walk all over you like you did in round 4.
instead of relying at tip range on this matchup, try being in a little closer, like around mid-ish range so that 44B doesn't pose so much of a problem for you. this way, he also won't be able to bait stuff like your iagA as easily. but don't get too close and end up dealing with 1K all day, because thats bad too. depending on what he does though, at this range, you can still bait some of his stuff for free whiff punish consistently, its just ALOT harder than it normally would be (as demonstrated by your SSH B whiff punish in round 3
always try for the faster moves/pokes. you gotta force him to stop attacking at disadvantage before you can really set any of your bigger, slower stuff up. also try to avoid 22_88B outside of whiff punishment, as (correct me if im wrong) im pretty sure thats a free iGDR combo on block. infact to add to that, SSH itself is just fairly dangerous against cervy.
its ok to turtle up a little bit in this matchup if you have to, so long as you can maintain optimal spacing.
don't get desperate with your SRSH stuff. mind you, you kinda did need it, but remember that a) its a huge risk, and b) don't be shy about using SRSH A+B as a safe outlet. worst case scenario, he'll GI it or whiff punish it last second, but thats why you gotta set up the stance properly, to put him in a position where he doesnt have enough time to step K_B so that you can pressure him accordingly with A+B.
i know its pretty risky, but try for a bit more 3A in this matchup. if you can get it on hit, your options are practically limitless. not only that, but it does a fairly good job of catching step, much like 6A does.
also, im gonna assume this was probably nerves, because it's your specialty, but don't get lazy on your punishment. you can't let him throw stuff like 3B into block for free. even if it's just a K, it gets the job done.
4K IMO is a bit more effective as a pressure tool, but even though this move is solid gold, it doesn't really have a place in this matchup other than desperate need of a safe TC, as 3B and 2A can do everything else at a bit of a safer range. that plus if you're using it as a pressure tool, cervy is great at controlling sieg's step, and its very easy for him to interrupt everything you do after for some decent CH damage.
CH fishing is a nice bonus in this matchup, but you shouldn't make it your main goal. get 1 or 2 CH 3B's, and you've already got the upperhand, all you gotta do is play it safe after that and kill him slowly. unless you screw up bad, he wont likely be able to catch up the damage (hence why i say its ok to turtle) and HITCONFIRM UR 3B's!!!!! RAWR!!! also, try doing your best to avoid getting CH'd yourself...
be wary of cervy's oki and tech trap game, as its really pretty strong, and it inflicts alot of pressure on the recieving player. best way to avoid this stuff is to avoid KND's or CH STN combo's, hence again why i say its ok if you turtle up a little.
On the bright side, you had some pretty good use of WR K in there, and your grab game seemed to work out fairly nicely for itself most of the time. decent use of 1K, i would have liked to have seen you do that more, because it was working out for you fairly well (excluding the random iTP whiff punish.) and don't be afraid to mix it up with more WR K because of that. WR K is a great alternative to 1K if you're in FC, and you can always use FC A, WR A, and 6A to control step if things start to get a little hairy.
Thats my take on things, Josh ^-^ as promised!