hgh is simply all around better. it gives you a larger, longer gh pulse, mobilizes fat more effectively and stimulates hyperplasia easier. you pin much less as well. an exogenous subq gh dose generates a rise for about 6 hours mostly due to the slow absorption rate of water through subq fat cells.
personally when I used CJC+ghrp2 for a while (ghrp2 is signficantly stronger than ipa) it increased my overall IGF1 levels by about 50% (110 -> 160), brought me from -0.05ULN to 0.5 ULN / Z score
I've read about some people hyper respond and report 2-3x elevated above baseline.
4iu gh daily hgh puts me around 400 igf1 level with a 1.75 ULN
If you want somewhere in between, CJC-1295+DAC was studied in medical literature and a dose of 30mcg/kg was reported to increase HG by 2-10x and IGF1 by 1.5x to 3x for 9-11 days in healthy volunteers. https://pubmed.ncbi.nlm.nih.gov/16352683/