I rinse my wet nappies as well (mostly). I'm trying the RG shaker stuff too - seems to work most of the time (unless I forget to get DH to rinse the night nap).
I had this issue awhile back - tried leaving the lid slightly ajar - less build up of ammonia, putting a drop or two of eucalyptus or Tea Tree oil, airing buckets outside and rinsing well before going out for an air, tried the citrus sticker things for the nappy bucket (can't remember what they're called) that worked for a bit but it was strong on the citrus smell instead.