If you're after
THE Okada sequence (tombstone > rainmaker taunt > rainmaker), you're roughly 80% of the way there already!
With a bit of tightening he could do the whole thing consistently on the appropriate trigger.
SETUPBack Grapple/Circle Opponent
We'll be setting up what's called a back gate. This is something Okada is a prime candidate for.
Ditch the dropkick and the hammer throw %'s. You want him to go for nothing but the rainmaker, the cobra hold, or the re-grapple german at large from back. Spike initially had him set up to like 40% german 60% rainmaker, and this is actually what I'd go for personally. You don't want him nailing two germans then doing a dropkick, or even worse, doing two germans then irish whipping.
Opp Down Face Up
Remove or dramatically reduce pickup at Opp Condition Critical. Have him stomp or do the running dropkick a lot more instead. We'll see why in a bit.
Do the same for pickup percentages in facedown.
Opp Dazed
Jack up that Back Grapple to 100%. You can have him keep his strike dropkicks if you want, but you'll wanna go full 100 to get really consistent with the proper end sequence. Once you do this, it'll mean any time he sends the opponent to a dazed state in near death (critical condition), he'll always go for a back grapple.
And because of the prior back gate, once he's in back grapple, he'll always go for one of his finishes, or the re-grapple german into one of his finishes.
THE SPOT PROPER
Once you've done the above, the following will happen whenever he picks up at large:
Opp is picked up dazed, edit goes for 100% back grapple into 100% back finish.
You're basically turning all his pickup %'s into finish %'s.
Given your current prio setups, whenever he does either tombstone, he'll do a rainmaker taunt then be priod into a pickup. Once he picks up, he'll go straight into back grapple finish.
Basically, you've made sure the tombstones always go to taunt, and that the taunt always go to finish attempts.
You'll be seeing tombstone > taunt > rainmaker very consistently with these adjustments.
***
Addendum:Mind the performance logic on the rainmaker taunt. If he does it randomly via natural percentage at any point in the match, he'll pickup and go into finish.
What's running face dropkick prio into? I'm guessing it's a sub at face down. Either that or it loops into itself.
Consider just straight 100%'ing the shoulder neckbreaker drop. It's obviously there as a midmatch pin, which is good visual, but may as well have it happen all the time to reinforce the spot.
Consider back switch. Either as a running move, as a whip counter, or as a standing grapple. If he has it as any of those and it happens late in a match, itll go straight into a finish attempt and is a great way to have his rainmaker spots come out either a.) more frequently or b.) from different situations.
I'd personally ditch the potshot rolling lariats as the visual devalues his finish.
Other than that he looks ayt. I'd ditch the DDT into nothing for another filler strike that leaves standing for him to pad out the late phase with, but that's more a personal thing.