I am currently playing in microstakes.
I searched some preflop charts and used them, but none of them were very good for me.
Now, I use the chart from APPS by Matt Juanada. yeah i know that he didn't create it and he already mentioned that it is far from the perfect.
However, since its opening range is pretty tight, i think it is okay. Also, I fixed some of that range, for example, it opens only 35% from SB but I open 45%. but there is one problem. it can be exploitable, if i don't use 4-bet bluff. it depends on the position, but for example, if i don't 4-bet bluff, i defend around 30~33% against 3-bet.
I think there is no reason to 4-bet bluff in microstake, since most of microstakes players' 3-bet indicates very strong hands. also, i don't think people are going to exploit my range even it depends enough vs 3-bet because most of them are not good and I am playing in HUDless site.

Do you guys think I should still use what i am using right now and fix it when I move up stake?
or is there any good preflop range chart that you can suggest?