Our pastor sits after Communion while deacons are consuming the rest of the Precious Blood and tells congregation to sit too. Should we?
. . . as circumstances allow, they may sit or kneel while the period of sacred silence after Communion is observed (43).
In 2003, the Congregation for Divine Worship and the Discipline of the Sacraments said the following about GIRM #43:
The [intention] is that that the prescription of the Institutio Generalis Missalis Romani, no. 43, is intended, on one hand, to ensure within broad limits a certain uniformity of posture within the congregation for the various parts of the celebration of the Holy Mass, and on the other, to not regulate posture rigidly in such a way that those who wish to kneel or sit would no longer be free (Prot. N. 855/03/L).
This simply means, although uniformity of posture is good but individuals shouldn’t feel they must kneel or they must sit after communion, its up to personal preference. You are free to make your choice of posture from the moment you return (after receiving communion) until the prayer after communion, during which you have to stand with the congregation