[splix]

Some diabetics gain a few pounds more with Lantus then Levemir users does for example, the effect increases with the amount taken. But 30 is still low in these studies, I think you have to take 50 units or more before you start to notice accordning to my diabetics nurse. Levemir is know to be what they call weight neutral, so even in quite large dose it's doesn't seem to make any difference.

30 units, have you tried to split them up? Take say 20 prior to bed and another 10 in the morning? That way you might get a more even uptake, some also say if you take bigger doses at once and in one injection, the body doesn't get the chance to take all up prior to the body’s defense destroying it.
If I take doses over 7-8 units I split them up and take them on 2 different places. I'm only on 16 units of Levemir before bed, but I take 8 units on both sides of the abdomen. I find that the effect is better with less insulin and has a more even spread over the day to come.

I used to take around 18-20 units before I begun to split them. My dad uses Lantus and takes 30 units, he also takes 20 at bed and 10 in the morning. I've asked him what happens if he swaps and take 10 to bed and 20 in the morning. If he does, he gets real low during the day and has to eat not to get hypo all the time. So, it also depends witch dose you take at what time, even if the total is the same for the whole day.
My guess is that if my dad tried what I do, he could use as low doses as 2 x 8 at night and another 8-10 in the morning. He has had diabetes since he was 16 (56 today) and he has never tried to experiment like this. I told my bother do to it and he got the same result as I do. He also cut doses when he begun to split them up.