BB Curve 8900 :: What Determines Picture Size In Kb On Software 5.0.0.681?

As per my other thread: What happened to my 8900 camera quality? upgraded from OS 4.6 to 5.0.0.681 i've discovered what the problem is with why I am not getting the same quality photos as on the OS 4.6 on my 8900 curve, it's the picture size in kb. on 4.6 i would at the very least always get photos of size 460kb minimum (usually i get 700kb +) whereas on 5.0.0.681 now i get on average only 180kb WHY? bear in mind i've kept all the settings on the highest possible i.e. superfine and picture on 'large' yet for some reason i'm only getting low quality pics.. it's very frustrating.I have a feeling the lighting makes a difference but also maybe the memory/space on the media card. BUT I have 120mb of memory left and 400mb of space on my media card.What makes the blackberry take pictures at lower quality in terms of size in kb and larger?so far i've managed to get 1 photo at 460kb on OS 5.0.0.681 but i dont know how or why exactly but at least i know it's capable of getting pics that large. Do I need over 500mb of media card space for it to take larger size pics?