Can't they counter poke you after the blocked d1?
First thing is I'd do what
fr stack said and study how they like to react after the string. What I like to do after a 1,2 connects is -- throw, another 12, f33, b1, d3 into more pressure or cancel into tackle/slide for the 50/50. If they like to jump after the 1,2 connects, you can go for a njp into xxxx, jip/jik into xxxx, d1 into xxxx, a standing 1 into xxxx or straight up teleslam their happy jumpin ass. There's also the tried and true 1,2 (on hit)~upknee for the +4 advantage.
After a blocked 1,2 I like do pretty much everything I said above except for cancel into upknee because the upknee will whiff entirely. Getting them to respect the shadow tackle will make pressuring easier, but I'm sure you know certain characters can punish you hard off a blocked 1,2~tackle/slide.