Its actually not that hard to block JC's pressure.
The general rule is that you fuzzyguard low as soon as you see a 11 string. Other than that you just have to block high all day.
It gets pretty nasty when your opponent is mixing in throws pretty well.
I, for example, have a dude in my friendlist who pretty much never gets opened up by the overhead or 113skrc and in those matches i would say that 50% of my damage comes from d4's, and the rest almost exclusively from pokes/chip.
I do get bodied by him 90% of the time tho because hes a better player than me in general and im to dumb to aa properly ;D
Your br right? if so, add me on psn: rafaww
On topic, i will break down real quick:
113skrc into 113: on block you can backdash, armor, or do a 8 frames or faster move between no matter what.
113skrc into Block: if you start to counter his 113skrc with armor/fast normal/move, he might bait that and cancel into block and be safe.
114skrc into 11: if you try to do something standing, you get hit, the first 1 of 11 is a high.
114skrc into f3: you have to respect that, or get hit by a full combo.
4skrc: pretty much the same as 114
Its really trick, but once you realise you just have to block high and do a slight touch in D when you see 11, defend his pressure becomes a little easier! Just respect what i told, once he starts to mix throws, there is where the nasty gets in
ps: D4 is a really good tool, if you get hit by it, you have to block his F3/F2.