To answer your questions
Victory was the shore barracks at Portsmouth. The numbers were just for accounting purposes
Shore bases with names in brackets smaller ships did not carry any admin staff, so all their paperwork, pay etc was carried out by a shore base, referred to as a parent. So, where you see, for example, Victory (Enchantress), it meant that he was serving onboard the Enchantress, but Victory barracks was looking after the admin work
Boscawen (Bleswedd) Boscawen was the shore base at Portland the name in brackets is actually Cherwell. This was an armed trawler employed on Fishery Protection duties
I presume you have the details of the various ships listed (Tiger / Enchantress / Royal Sovereign / Boreas / Duncan /Keppel / St Fagan / Cherwell) ? and the shore bases?