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The simple answer, @JeffM.22 , is yes. The volume would go up. However, that’s only part of the story. The heavier gauge strings would also be harder to fret, bend, pull off and hammer on. The real problem is technique.
Make sure you are hitting the string with speed, not necessarily strength. Also, the most important thing is accuracy. You must hit that string dead on with the very tip of your finger. Between hitting the string fast and accurate, hammer ons can be quite challenging to learn. They are definitely more difficult than they seem when you watch someone who is good at it. A good exercise is to use the high E string, starting on the 5th fret with your index finger. Holding the 5th fret with your index, strike the string and then repeatedly hammer on with your middle finger. Do this as fast as you can focusing on accuracy. Then do it with your ring and pinky fingers. After those 3 exercises, hold down the string with your middle finger and hammer on with your ring and pinky. Finally, hold the string with your ring finger and hammer on with your pinky. This exercise will tire out your hand very quickly. You will develop finger strength and independence very quickly as long as you don’t hurt yourself. Do it everyday, but do it for short periods of time. You will be amazed how much fatigue and stress you will build up in your hand. It will help, but you have to be conservative. (You can still be liberal in your views if you choose. 🤣)
I hope this helps.
MG 😀