Rate and help with my Eirika team

Welp, one of my objectives in this game was to build a theme team with eirika and her friends,(as well another beign the ephraimites if someday im able to get Innes), and this is the team right now:

Eirika (+atk -hp): Seiglinde(+eff), Rally def/res, Moonbow, Tri-adept3, SwordBreaker3, Hone speed, Def tactics Seal
Tana (+atk, -def): Vindofir, Reposition, Moonbow, +def/vel2, hit&run, guidance3, close defense seal
L'arachel (-atk +spd): Ivalid, Ardent sacrifice, Iceberg, Fury3, Renewal3, Res Tactic, Spd+3 seal
(L'arachel usually switchs ardent for draw back and renewal for desesperation when going to colisseum.)
Amelia (-hp+res): Slaying axe(+spd), Reposition, Ignis, Earth boost, Renewal 3, armor march, Armored boots seal.

As you can see, some skills are very doubtous, as some of them are the base skills. Despite not beign totally f2p, I rarely spend money so i have limited skills for inheritance. Ideally, I would give DC to amelia and eirika, L'arachel would use both tactics(def/res), Tana would have close def in A slot, drive spd in C and guidance as seal, and amelia would change her C for atk tactics. From this list, the only thing that i can do right now is give Amelia atk tactics, as i have a spare siegbert.

With that distribution of tactics, eirika would get +12 during combat to atk,def and res if she stay close to the team, and the rest of the team would get the stats they need for their roles (tana and amelia defenses, tana and l'arachel atk).

Should I give amelia atk tactics? I just feel that using atk tactis in this team would leave eirika's sieglinde atk buff a bit useless, but thinking in eirika getting +12/+12/+12... Also, any ideas for others skills are welcome.