With 7 WM you should have more than enough. With 5 WM I have PT 5, 104 throw wpf and 125 melee wpf and can equip heaviesh armor like lamellar + nord warlord helm.
You might not wanna go up to PT6 tho. PT 4 (heavy axes) and PT 5 (jarids) are fine. Throwing spears aren't that great for a hybrid, individually they aren't as good as jarids, the only advantage is ammo, if you are carrying 2 stacks that's probably more than you need and you will be wasting your time throwing when you should be in melee or ending the round with lots of leftover. I usually carry 2 stacks of axes and usually end the round with leftover unless there's a shitload of horses. Spears are better for a pure thrower gimmick char who really needs the extra ammo cuz he can't melee.
You could even go PT4 cuz IMO axes are better than jarids for a hybrid. They have fast windup so you can get off shots quickly at closer range, and they are better for defence cuz they hurt unarmoured horses more. Plus they are decent melee weps if someone charges you and you just have time to hit x.
Jarids are more accurate and longer range, so are a better support weapon to snipe at heroes at 20 yards distance.