Save to web and devices did the trick, managed to knock the image down to 27k without drastic loss in quality.
Ok. I completely deleted the background image all together yet it is STILL 150k, wtf is iSig doing!?
Edit: No wait... just went down to only 113k ( - -)
Edit: Went back up to 150k *Snaps*
Edit: It shaves off 40k for each 50px deducted, going to have to resize the entire signature...