You can wear anything you wish too as far as it respec your wpf limit. Generally if you want to have heavier armor, you'll need more wpf, if later on you wish more PT, you'll need more wpf. What you have there seems good and shouldnt need to much investment in throwing so you can concentrate on 1h.
Even though 100 wpf with 4 PT should, in my opinion allow you to wear heavier gear (i get to use 7 pt and throwing lances with 110 wpf and that armor, just saying). What you might want to do is go to duel server take your throwing axes and try different equipment on to see when you get the message (or just the formula to calculate)
In conclusion i believe with the build you have you can wear heavier armor or get more PT. Iv just calculate, with your build you need about 71 wpf for your throwing axes, you have 100!
you have then different solutions :
-Get more PT, you could probably take 2 extra!!
-Get more heavier armor!!
-a bit of both, extra PT with a bit heavier armor
-or for the next time reduce your throwing wpf.
whatever you do, if you stick with slamz build i dont think investing more wpf in throwing is necessarry, put the rest in 1H!
Also, IF is the last skill i would invest when doing my build, if i take some of that, i would do it when I'm about to finish my build, there are better priorities. also IF isnt much uses in light gear.
For your loompoint, a lot of people suggest, after first gen, to sell it so it, helps you to fund all your equipment you need to repair and/or buy