I will say, just as a quick aside for 1.10; The "Infinity Lite" pack for 1.10 is not in fact a "light" pack, as you've discovered,
however: It is possible to put together a very small group of 1.10 mods, and play them together. I only have 3GB of RAM, so I still have a fair bit of slowdown at times but it is (to me at least) playable. But I've found that certain bigger mods, like TiCon2, EnderIO, and even Refined Storage, don't even load up fully before I get an "Out of Memory" issue.
I run out of the vanilla launcher, there are a few steps to it, but its not too bad.
But, if you want to play a proper pack, that's had time for the bugs to be worked out, 1.7.10 is probably your best bet