I think best would be to start over the “learning” process for you and your gasifier to get to know each other.
1: sieve out any fines and dust , smaller then 10 mm
2: sieve out anything bigger then 50 mm
3: only use anything between 10 and 50 mm for the time being.
4: Fill the empty gasifier with clean charcoal, even sized pieces, use the same size as above for guidance
5: only when all the charcoal is glowing and is glowing up to the top level, then ad slowly and evenly uncharred material but never completely cover the glowing bed.
6: learn to balance that consumption of glowing carbon with the feed in of new material.
7: start at low gas flow, just to get the good feeling in balance
8: stirr the lower part of the char bed regular to avoid bridging
FYI: rice husk does form very sticky ashes, slag due to the very high silica content. Don’t use that untill you succesfull know how to balance your gasifier at any given condition.
After as many hours as possible and only if you manage your gasifier well, then gradually change your fuel bit by bit untill you reach the limits of what is possible with your fuel and gasifier.
Question; what is your current location ? I am in Thailand, guess not to far away from you to hop over.