Hey there, Well hmm where to start. First off, about one being male and one being female. One biting and other not isnt really reliable indication of anything as far as sex goes. In fact with lovebirds finding out their sex is pretty rough. The only really reliable way is to have them surgically sexed at a vet or to send in a feather or blood sample to have DNA tested. It cost a little over 20 dollars. Look at Avain Biotech, they have a website with alot of info on how to sex your birds. What makes you think one is male and on is female? Or do you think that? I see the names are girls. Just because you bought them as a pair in the store doesnt mean they arent both boys or both girls. Having two male Lovebirds together should be fine but if they turn out to both be females you will have to make sure the arent housed together because they can become territorial. As far as you each keeping one, i think thats fine if it works out the best although make sure the birds get enough attention, for if it doesnt have a birdy friend its your job to fill those shoes.

AS far as getting them to be more affectionate that really just takes time, you need to work with them alot and get them to trust you. Its very possible to tame the birds down a lot but as soon as you stop working with them all that work can quickly be forgotten.

I buy a taste deterrrent like bitter apple or Bitters from the pet stores when iwork with birdsthat like to bite, i spray it all over my hands. Some birds dont even care and they still bite away although a few of my birds have learned NEVER to bite a finger because they hate that taste. Its worth a try. Like i said somie birds taste it and wont bite and some just dont care.

Some people believe giving birds pellets on top of their seed diet is very important but it sounds like you are giving them a nice array of foods.

The chirping clicking noise is most likely very normal, my birds make all kinds of sounds like that and they do mock you if you make kissy noises at them and stuff, you should notice that if you repeat anything to them they will try and mock it I always click at my Walter bird and he can click just me now. Maybe you can get lucky and teach them some words! I am trying to teach my newst lovebird words, she just seems so vocal i think she may be a good talker with time.

Have you offered the birds a bath at all? I always thought that was one the best things about having new lovebirds, watching them frolic in a bowl of water. Just set a big dish of water up and see if they bathe. Good luck!
I hope you are enjoying your new little sweeties!