I've applied for PhDs with a similar background to you, and no, I absolutely did not include specific module marks. I detailed the areas which my degree covered (which will be fairly diverse if you're doing pharm. science) and listed transferrable skills. The idea of a C.V. is it allows an employer to quickly gain an overview of you as a candidate - it is not meant to be a detailed account of everything you've ever done. You should be able to summarize yourself in 1-2 pages, and frankly, using space on things like module marks (which don't say much other than you got X% in Y) would not reflect well - that space could be better used.
But yes, you absolutely should save some space for any research projects you have done, for that is highly relevant experience. Also, if someone has been telling you that you need 80%+, you should probably stop listening to them; that is not good advice. Like you, I got something in the 70% range, and nobody - I mean nobody - has ever asked me why I didn't get 80%. Actually, I made damn well sure I knew what I did/acheived in my project inside out instead, and furthermore, could relate it to whatever project I applied for. Trust me, potential supervisors would rather have someone who is passionate and interested in their project than someone who simply did well in it - because, again, 80% is just a number. It doesn't actually say much about you as a person.