Hi, I reached 1500 rating once at my "peak" at the end of 2013 (about 8 months after starting online play again) but since then and despite being vastly more experienced I can't seem to even maintain 1200.
Just Fyi including custom and ladder matches I have played about 3500 games. I often wonder how the pros do things, I have watched countless of pro replays but they don't make me any better.
In fact, when I follow pro recommendations it seems to make things harder for me, not easier. For instance transport use on maps like point of reach and Roanoke's Abyss.
My last two games on that I did far better because I did not use a transport to rush engineers to the expansion islands, instead I just sent engineers out on their own which negated the interceptor threat to the transport and bomb threat when the engineers have been landed on the islands.
Here are the three replays in question:
One win, two loses, but you will notice how strong my early and mid game was in the ones where I didn't use a transport. Building a transport so early in the game makes your economy take a big hit and if it is intercepted you lose big time. And yet, the pros would recommend that you use an air transport.
Note that the transport example is just one example. In general I find doing things my natural way works out better than trying to use pro tactics. And I don't find watching replays ever helps either!
I just want to achieve a 1500 rating, nothing too great, just 1500 to get respect when people see me, that's all.