What your trying to do is quite hard and i am not to sure how this can work in a chained combo because although st.strong has range to connect after an upward aegis, it may be the strength of the previous tackle that is not giving you enough range to continue after the aegis. But I can give you some other helpful tips:
Crouching jab–> short tackle should do the trick (again you MUST be in range), but if your sending aegis upwards you can always dash and throw whether the previous tackle was a connection or block stun.
If blocked after the tackle–> ex aegis, chances are your opponent will stay standing rather than crouching to avoid an overhead, so in this situation its best to go for c.short then s.fierce cause with the obstruction of the aegis, the two ‘tap’ moves can be comboed in.
Apologies if I have said this in a bit of a ‘hard to understand’ or complicated way, but I am sort of in a rush and i gotta go.