Replaced my crackset, chain keeps popping off the small chainring under load
Assuming you have a 10sp RD 350 SS short cage (R350 GS seems to be a 9 speed item), you have possibly exceeded the total capacity and are not getting enough chain tension.

Capacity with 48/34 rings was 48 + 36 - 34 - 11 = 39. Capacity with 46/30 rings is increased to 46 + 36 - 30 - 11 = 41. AFAIK, only long cage derailleurs for triple rings have that much capacity.

Do you really need a 30t small ring? Would increasing it to 32t - to decrease the total capacity - be ok for you? Alternatively you could think about replacing the derailleur.