I'm sorry for my english, I hope you will understand ^^; I have to use the translator ^^;
1. Well, my main tip is don't record separate lines of sounds, record a block of sounds. I mean...
For example, you record the "ba_ba_bi_ba_bu_be_ba" line, but don't stop! Just make a little pause and continue with a second line "bi_bi_bu_ba_be_bi_be" and so on. I usually do from 5 to 10 lines in one record. It saves your time during the record (though when you will finish, you will have to cut the whole record to several records, to "ba_ba_bi_ba_bu_be_ba", "bi_bi_bu_ba_be_bi_be" and so on) and you and your voice don't get tired too quickly. And it is very important if you are recording a strong voice. Due to this method I record a full VCV voicebank in 1 hour, though it takes half an hour to cut all the records into parts .w.''
2. Before to start the recording, find some vocal tips about how to train your voice and how to warm up your throat and prepare your voice for singing. Your voice must be sonant for a strong voice.
3. Eat half an hour before to start recording, your voice also needs energy, but don't eat anything with crumbs (cookies, chips, nuts and so on), it can harm your throat during singing. I always eat some soup =w=
4. Record in a standing position. When you are sitting it shackles your lungs. The sound will be more clear if you stand with a straight back.
5. Drink a full glass of water every time when you feel that your throat is tired and take a rest for 5 minutes, don't rest for too long. And don't dring tea or coffe during and before the record, those drinks actually don't do anything good to your singing (or recording) abilities, sorry I don't know how to explain in a better way ^^;
6. Singing in a low voice doesn't help. Try to represent the voice and the tone like you are angry and you are going to shout.