I don t know if there is any magical tool for parting. Wether it s inserts or hss i think imop. It comes down to the tool geometry, and your speeds and feeds. It s one operation where you can t sway from what s proper maching or it will bite you but get into that area and have a nice shear cut that you can feel if hand feeding. It s a good thing to learn with the hss to understand what tool geometry is rather than buy what works. I think you will find you will always be going back to hss even when working with carbides and understanding how to make tools is a skill you ll need as projects progress.
Don t be shy with your tool. Get in under then back off your presssure once start cutting. Alot make the mistake to baby there entry. Leading edge, rake, hollow ground go find that shear cut!