HTC Hero :: Resizing MMS Pictures To Something Less Teeny

I've been using Handcent sms for my messaging, but when I do a MMS by adding a picture, it will resize the photo (often with a double pop up asking if I want to) to a "small" size. The limit of my mms is set as 300kb, but often the pic resize will make it 6kb, which isn't as bit on the Hero screen as some incoming images. Is there something I can do to change this? I've tried sending myself MMS messages both from the Hero Messaging bit and from the Handcent SMS app, but both seem to come across as smaller than pics sent by others. Is this a Hero issue, a Handcent issue (even though it happens via the Hero messaging software), or my own network issue?