I wouldn’t recommend starting this combination or doubling the doses. SARMs are not an established safer alternative to steroids for young adults. There is no validated safe bodybuilding dose for this stack, and equal milligram amounts do not mean equal potency or risk.
The FDA warns that products marketed as SARMs are unapproved drugs associated with serious problems, including liver injury, sexual dysfunction, infertility and potential cardiovascular complications. Your age does not protect you from these effects. FDA
Combining three experimental compounds creates additional uncertainty and makes any side effects harder to attribute. Doubling the amounts would increase exposure without establishing a predictable improvement in muscle growth.
Your height and weight alone cannot tell us whether you’ve exhausted your natural progress. Reviewing your training history, calorie intake, protein, sleep and consistency would be a more useful starting point.
If you’ve already started, speak with a qualified clinician before increasing anything or adding more drugs to manage side effects. Blood tests may identify problems, but normal results cannot certify the combination as safe.
Further reading: FDA guidance on SARMs in teenagers and young adults.