I recently graduated with a bachelor's degree in economics. I'm now applying to research internships and some of these need recommendation letters from faculty. 

I did very badly during the first 2 years at college (having scored around 6/10 (=2.4/4) GPA in my courses until the end of my 4th semester) -- however, I learnt from my mistakes and became much more disciplined in my 3rd year, when I scored an average of 8/10 (3.2/4). At the end of 3 years, I had to graduate with a sub-3 CGPA of 6.88/10 (2.75/4). 

I did really well on research projects and other quantitative projects at college, which is one reason why I've found professors to recommend me. I understand that my poor GPA will probably put me in a bad position, but what's done is done and I digress. One of my possible references asked me to draft a letter for him and that he will make changes as necessary before sending it in.

My question is: should I ask my references to talk about my poor grades (something along the lines of "While X does not have impressive scores in his undergraduate degree, it can be clearly seen from his transcripts that he picked up pace and discipline during his final year. I believe that X has taken home the importance of hardwork after a few hiccups in his academic life".)

Even if the above phrasing doesn't seem good, in general, is it a good idea to talk about your bad grades in a recommendation letter? Or is it simply better to let this go and concentrate on my strengths?