So I tried to post yesterday, but idk what Happened.
In your first match, it seemed like you were content to chill on your back, which could be a good thing, but in this case it wasn't as productive as you had hoped. Like everyone said if you have lotus flexibility the jailbreak is awesome. I dont have lotus flexibility and if you don't have lotus flexibility, I suggest continuing to work the Ghost Series, and to introduce the Flow into your half guard escapes. From the flow, you'll at the very least end up in lockdown again, and if done right, you can land in double butterflies with potential over unders. Being a big guy as well, I know how frustrating it is to whip up someone just as heavy as you, and/or be stuck under someone just as heavy as you. This is when your technique has to be extra crisp (like a small guy), and your timing has to be perfect. Continue to work your wrestling as well as your sprawls, and add some standing guard passes in (Knee Slice, M1, M2, Jeff Glover Step back) those will help your agility and if you can move like a 185'r or a 205'r you'll definitely have much more success. Keep your head up and continue to push forward, work on being a mobile big guy, not a typical big guy. Best Of Luck Buddy you'll crush em next time.