It sounds like you have had your hob/male "vasectamised" which is the right way to go, easy to tell, has he got balls?
As for the jill being slim, my jills are always a lot slimmer in the summer, partly down to coat and partly down to hormones i guess, as they always seem to "fatten up" come the winter.
The two hobs will fight like cat and dog until about september time, no need to get rid of one though, just buy a spare hutch. Problem solved.
Hope this helps.