Yes its 63 for ba without fana.
No 70 should not cover arach slow.
And ur wirl will have low ar typical on a throwbarb, so beast is still prefered for PVP, and your beast can be combined with a 3bo metamorphosis in CUBE to give urself mark of the bear for 180 seconds 25 EIAS and 20% DR.
And unless you run a almost zero fcr coa barb your going to lack both DR and ias without Mark of Bear.
Winged harpoon + eth lacerator
beast + doom (thats the proper BO/Precast/Annoying wirl combi)
Coa 2 x ias/ed jools or epic nice barb diadem with simular 2 soc
Enigma
20ias/kb gloves is fair yes.
Highlord
arach
wisp
raven
gores
Here is an example, used lacerator and warshrike here.
https://maxroll.gg/d2/d2planner/wq7el0ml4fpa throw, max wirl ias, mark of the bear, max res, high damage, good ar, good frw. The 4fpa breakpoints take away the 40fcr posibility.
By using a 20fcr/3soc diadem of the magus, you could reach 3,5fpa throw. And alternate between 20fcr/3,5fpa and 40fcr/4fpa.
When enemies are amped your wepon and wirl / axe mastery skill level gonna outperform normal bvc.
15,9k ar and amp and doom and beast is quite good wirl. Quite BM as well... So yes, if no doom u can use a death or grief instead doom. But beast is neccesary for mark cast.
D2:R