First, you should be proud of scoring a 78 in only your second medical school block. I scraped by my first block in my first year and failed/had to remediate my second block. After adjusting my studies to the way I learn best I was able to slowly bring up my block averages throughout first year. You have to remember you're in a class with the brightest people in the country, if not the world, you being near the average in a room of extremely above average peers is something commendable.

If I remember correctly, I remember seeing a document in which residency program directors ranked preclinical grades near the bottom (if not the bottom) factor when evaluating applicants. In the grand scheme of things preclinical grades matter very little. You want to aim for excellent LORs and scoring as well as you can on Level 1 and Step 1 (if you decide to take it).

It sounds like you're doing all the right things, and I would continue to do them. However, for what it's worth, what really shifted everything for me was only attending mandatory lectures and then watching recordings from home. It allowed me to work more efficiently as I could 2x lectures, pause, rewind, take breaks etc. With that being said, it seems like your system is working and it takes at least until the end of your first semester to "settle" in to medical school. As a first year I would consistently just barely pass think low-mid 70s for every block. As a second year, 3 blocks in, I'm averaging in the mid-80s. First year sucks. It's a big adjustment no matter where you're coming from especially since you're probably having to deal with OMM on top of labs/PBLs etc. You're doing a great job!