I have absolutely NO idea how to play survival, but I thought I’d test this and see how it reacts.
For me, does about 1.5-2.1K LESS than what I should be getting. BUT, as I saw you mention that you don’t have neither AHK nor keyboard/mouse software to fire for you – you fire manually… the manual dps versus auto-firing is substantially less than if you were to use something to press for you.
For example, manual pressing did around 1.1-1.2K whereas my keyboard software, firing at 50ms, did 2.2K.
So, I’d recommend you either research if you can get software for your keyboard or mouse. If not, I’d suggest using AHK as again, the damage was substantially more than manual pressing.