In regards to survivor lethal's, LV has a single HG shotgun and the DB in the shack that's easy to get to, otherwise you need to restore power or break in to secure to get any other decent equipment or ammo(Only one box of shotgun ammo outside secure).
Solaris has 2 HG's in sec as well as 2 MP27's in operations, MP27's an't that great though 2 boxes of buckshot and 2/3 boxes of slugs, likely considered the best balanced map by survivors.
Prison has a ridiculously large amount of guns as well as ammo, even just looking at armoury you have a decent amount of M16 ammo as at least 2/3 HG's with buckshot boxes for each as well as Grenades, considered the best map for gear by most.
Ice has 2 HG's in admin as well as 1 HG in disposals however, only two box's of slugs on the surface, in order to get any buckshot or other weapons you had to head underground towards the underground armoury.
In short unless we are talking prison it's pretty hard to reduce the already low amount of weapons and ammo that spawn, I'm also not mentioning corsat as I don't really have the experience to talk about corsat as it never get's voted.
and in regards to the large(2?) amount of survivor topics around current I'll likely make a gitlab suggestion for changes related to them AFTER XSS, marine defense update and MOBA xeno's are released to main so I can check what things they might need, because once all three of those are released the role it's self it be at the worst it's been in a long time.