Hey,

Let me start by saying that I dont have money to buy gto preflop solutions, even if that would be a great way to get what i want here.
I've seen some solutions for big blind play, but its not super helpful here..
I'm trying to build default ranges for every spot, where I assume Im playing at a table with strong regs, with typical good ranges for each player. I know adjusting quite radically to recs is important and I am definitely doing it, I just want a good baseline where its less random button pressing, also when I'm adjusting to the table.

So the spot that I struggle with atm is BTN vs. MP-UTG 20% open. I want to build a 3bet+flat and 3bet only range.
Lets assume its 3x raise sizing, which is by far the most common sizing that I face. Rake where I play is around Stars NL100 rake.

What I have so far is around 10,7% 3bet only range, trying to cover different boards well, so some lower pp and lower suited aces mixed in with the usual stuff. Mostly questioning if 10,7% is too tight?

For 3bet + flat, I have a total range of 12% (naturally a bit wider than 3bet only) and 61% of this range is being 3bet. Mainly wondering if my ratio is good here, or should I be 3betting substantially more of my range? I think I heard Tyler Forrester say in one of his more recent video that 3bet range should be much wider than call range in a preflop spot like this. For call range once again I think I have decent board coverage (ofc real "gto" solution would be much stronger) and some idea what hands like or dont like flatting too much and some mixing, that I can do pretty easily while playing.

In practise it would probably be smart to play 3bet only when its regular opener and strong players on blinds. Then play more cally and wider range, than what I'm building here when theres a recreational player on blinds. Which is what I will always do, but never the less, I wanna get more indepth with these spots and I think building excact ranges like this will be beneficial for more explo play too.

Any help is appreciated, especially if something seems far from right!