You only did one sperm test, it proves little, hey sperms have good days and bad days :wink:
Its best to "produce" it in lab as time will be a big factor effect the motility of sperm.
May be you can try this:-
1) have your husband to take zinc and multi-vitamins;
2) tell your husband to keep that "area" cool, by which meaning no wearing of tight undies...the ideal temperature for sperm is just below body heat.