I am not squatting less weight than what I lift for biceps. When squatting I have 35 kg on my back plus my entire body weight. That’s a total of 140 KG. Which is more than the 40 KG I use for biceps. I lifted to failure for the last two years and before that I did not. I got at my heaviest and looking more muscular when I was focusing on lifting heavier and heavier for 2 sets without ever going to failure or even approaching it. The last two years (2016-2017) of lifting to failure has left me exhausted and demotivated. I felt tired, exhausted and irritated all day long and I felt like I could not sustain any physical or mental effort for very long. That’s why I stared lifting at 75% of failure. To make it easier on my nervous system. That’s why I’m now asking on this forum if doing more sets as opposed to going to failure, will stimulate the muscle more. If it’s even worth doing more sets. Based on my personal experience whenever I have increased the load even while decreasing volume at the same time, I got bigger. Anyway, regardless of whether the way I had been working out for the past 14 years is “correct” or not according to bodybuilders all I know is that I am quite big and have quite a bit of muscle. I have more muscle than my uncle who works in construction all day long for the past 25 years and who’s taller than i am. I am also very strong and when I walk in the street people don’t see me as a skinny or normal guy. So obviously I have been doing the right thing. Agreed it’s not traditional but I don’t have time nor money to waste by going into a gym every day and doing 30 different exercises that target the same muscle. I’m exaggerating but what I’ve done so far has worked great for me.