Just want to address the first part of your post about there not being many spots to find t4s on siptah.
There are tons of npc camps all over siptah and it’s fairly easy to get all your t4s without ever doing a surge.
The only t4s I do surges for are priests since they have a fairly high rate depending on which surge you do and sometimes bearers since I have crap luck with them from npc camps and cages.