Update: I have found the addresses of the upgrade level of the charm, the quality value of the charm, and the values of effects used on the charm.
In the example it will be Attack Charm, which is a common quality charm (evident by the lack of suffix). Upgrade the charm once so it says "+1 Attack Charm", then search "1" in Dword. Once the search is done, upgrade it again, and search "2". Do it several times until there are 2-3 addresses left, with two of those addresses very close to each other (for example, if one is 12345678, the other should be 12345778) and one of three addresses that are left seem to be going nowhere, check by doing a goto and see if the address one above (with earlier example, the address would be 12345674) has 1-4 value (1 for our example).
Here are the addresses you can find (that I have found so far) as well as what value goes into them.
1- Searched and found addresses = Determines the upgrade level of the charm. Can be anywhere between 0-15. Assigning it 16 or above glitches the sell value of the charm, and makes the main effect of the charm become +0%
2- Address above the found one (-4) = Determines the quality of the charm and can be anywhere between 1-4. 1 is common (grey background, only main effect and no suffix), 2 is uncommon (blue background, main effect and 1 bonus effect, has suffix), 3 is rare (purple background, main effect and 2 bonus effects, has suffix) and 4 is legendary (yellow background, main effect and 3 bonus effects, has suffix)
3- The following addresses below the found one (+4, +8, +12 and +16) = Determines what effects are on the charm, with a very specific exception (see 3.1). Value in the first address is the main effect of the charm, and following 3 addresses are the values for bonus effects. Values are below.
3.1- The second found address = One of the two addresses that have the Quality Value address above them, might have 1 as the value of the Main Effect address. I have no clue what this address does, but it might now be a good idea to edit this value. Incase of this, add an extra 4 to the address while looking for them.
Effect Values: 1=Attack, 2=Fire Attack, 3=Ice Attack, 4=Lightning Attack, 5=Cosmic Attack, 6=Elemental Attack, 7=Critical Damage, 8=Attack Speed, 9=Critical Rate, 10=Skill Cooldown, 11=Attack Buff, 12=Stun Time, 13=Freeze Time, 14=Coin, 15=Power Stone, 16=loops back to Attack?
So even with this, can someone else try it? I have found out that the charm does not change or get the extra added bonus effects until you fully close the game and then reopen it, and even then, the percentage increases of these bonus effects become broken (as the game remembers the previous bonus effect's percentage). As in, game will adjust the main effect's percentage (a +15 Stun Charm that gives +135% Stun Time will turn into +60% Cosmic Attack when edited into +15 Cosmic Charm) but not the bonus effects percentage (a charm with +15% Attack and +10% Elemental Attack bonuses, when edited to be Fire - Ice - Lightning, will turn into +15% Fire Attack, +10% Ice Attack and +0% Lightning Attack bonuses, even though all 3 are supposed to be 10%)