Well come back man.
Yeah lots of things happened while you were gone.
I watched the videos you uploaded. Here's some feedback since you asked:
vs Sub Zero:
You don't seem to pay much attention to what your opponent is doing. You got hit at least twice by full screen slides. You should have jumped or blocked and full punish those. When you did manage to block a slide, you didn't punish at all.
1:16 - See that's also where gun cancel comes in handy. If you hold your shot and notice your about to trade vs sub, you can always cancel with F, FU and Stryker will just jump over ice blast. This simple trick can avoid you 30% life loss.
1:29 - You gun shot xx uppercut. That's good, but then you try to go on offensive with double dash + jump and sub easily AA with uppercut. After you hit Sub with uppercut you should have played it cool, dashback and gun shot held. You see Sub going for a slide? Gun cancel into jump forward. He does nothing or tries to shoot ice blast? Shoot before his projectile even comes out.
1:40 - Never use gun shot from this distance (mid range). From this range you should be thinking about gun shot cancel into poke, jump or throw (if opponent likes dash blocking). Sub could have easily slide on reaction or jump into full combo.
vs Jade:
You played this matchup well. Good to mix up gun shot with roll toss because Jade likes to Glow a lot vs Stryker. You made some great reads. Especially at 1:00. Like that jump punch into standing 4 xx roll toss.
That Jade didn't seem to know the Stryker matchup though. So It's kinda hard to really tell how well you played. It seems the Jade player was just bad overall.
A good Jade would have given you trouble. This is a bad matchup for Stryker imo. Glow completely shuts your zoning game. She can keep you out with her boomerangs but you can't touch her. You have no choice to be more aggressive vs Jade but then her EN invincibility can parry your attacks and leave you vulnerable for full punish combos. It's tough.
vs Kitana:
This is really one of Stryker's easiest mathchups. There's nothing Kitana can do vs Stryker's superior zoning. And even when she gets close and tries to go on offensive you can easily block and punish her attacks, crouch tech, anti-air, jump over or x-ray/ex roll toss and start zoning again. And even if she manages to touch you, you should have build so much meter by that time you should have a breaker already lol.
You won but you didn't exactly play your best: You were dropping your combos, didn't punish her square boosts, whiffing B3 when you weren't in range, using gun shot at mid range again or when you didn't have zoning advantage etc.
Overall you played good. But if I could give you some suggestions to improve I would say:
1. Have a gameplan for each distance you find yourself in (full screen and far: you zone/counter zone. Mid screen/jump distance: you play footsies, anti-air, gun cancel. Up close: crouch tech, build meter, jump over punch or neutral jump punch, mixup, use armored EN to gtfo etc.
2. Try to keep track of your current zoning "status" (do you have zoning/speed advantage? Are you in disadvantage? Are you on equal footing with your opponent?) and modify your playstyle accordingly. If you have advantage, go in zone mode. You gunshot will always cancel their ice blast so you're cool. If you lose zoning adv or are at equal speed with opponent, it means your gunshot will either trade or lose flat out. You don't want that obviously. So that's when you need to react to their zoning (roll toss, crouch or gun cancel jump etc).
3. Always punish slides, whiffed specials and teleports. Everytime you block a sub-zero slide you should be punishing that. I know online it's harder though..
4. Keep your combos simple. End them with either roll toss, uppercut or reset. It's better to deal only 25% but have zoning advantage than risking a hard to do 35% combo that could leave you at disadvantage if you drop your ender.
5. Don't rush too much with Stryker. 80% of the time you'll fail. Stryker has good pokes and mixups but he's not a rushdown/mixup character. You have to know when to pressure and when to lay back. If you wanna go for crazy mixups and pressure, do it after a juggle reset (using standing 3).
Hope that helps.
edit: I just noticed you had 3 more matches vs Scorpion, Ermac and Johnny Cage. I'll watch them tomorrow and give you feedback
Maybe we could create a new thread for that. Something like: "Critic my Stryker playstyle"