that is very hard!!! have you tried pureeing you own meats...they have a grittier texture and then slowly work up to lumpier foods like canned pears which are soft enough that he could smush them in his mouth and soft pieces of bread or cheerios? maybe that might help with him getting used to lumpier foods. My lo still isn't a huge fan of lumpy foods and he is just about 9 months so I wouldn't worry too much. He used to spit out all the lumps too or just chipmunk them in his cheeks and I'd see them there hours later! :roll:
Good Luck!