How many girls to boys ratio?

Probably asked already sorry for asking again ....
Looking at 4 maybe 5 girl's...
Male would be at least 800 grams

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Are you referring how many girls can that one boy breed? You could throw him to all of them, however you should have a schedule so that he gets time to rest between pairings. I use a 3 day on 3 day off schedule. So I will put him in with a female for three days and then give him a three day break (feed etc) before he goes to another female.

A 1.4 or 1.5 isn't a problem as long as you give a break as already mentioned.
You can breed year round so its not really an issue.