I think most have seen the charts showing the diminishing returns when upping doses of GHRP. Diminishing returns are very true and with all drugs. But it's just a chart so everyone should do what you did and experiment for themselves. That's the only way to know if it's worth dosing more than the internet's stated dose.
I will say the GHRP's respond differently. Hexarelin comes with a strong chance of increasing cortisol and prolactin for example. Therefore, I wouldn't be recommending dosing 500mcg throughout the day. Moreover 200mcg feels very strong and the research has shown a big hgh spike at 100mcg. But 200mcg definitely feels better and there is room to experiment.
I am unsure about details but I recall trying 500mcg GHRP-2. That dose really increased my short term appetite. Most of the time I would dose 200mcg. A couple of people have told me about them dosing 1-1.5mg GHRP-2 in one shot.
The issue with GHRP spikes is they don't last that long. A higher one will take slightly longer to come down but it's still not very long. Thats the reason frequent dosing is optimal. But for many twice daily is more than enough for good results. I plan to give hexarelin another go sometime in the future. I will dose how I recommend at stick with 200mcg twice daily. I really like hexarelin pre workout.