The problem here is i've already compressed the images as much as possible in photoshop so would require some pretty major work to get it smaller than 225kb. The pdf options don't allow to determine the resolution or compression of those two images and hence can't control the output size very well.

Distiller is the adobe PDF creation tool but i haven't seen what it can do with word document or if it works at all.

Distiller usually works as a printer driver.

Something I've noticed on windows is that if I drag/drop a picture onto a page it converts it to its bloatware format, however if I use insert:picture it leaves it jpeg sized. It's made the difference between 2MB files and 100kB files before. I forget if it makes a difference on the Mac side - our drag/drop interface is much better.

Andrew