Facemill Inserts for aluminium

[Wongster]

Hi guys, 

Me again with all my newbie's questions. 

I bought a facemill years ago out of impulse and would love to use it rather than having it as a paper weight. Got it from CTCTools.biz with an MT2 taper and M10 drawbar. The set came with 10 inserts of type AMPT1604PDER-H2 VP15TF, which is supposed to be for stainless and harder steel.  

The last time I used it when it arrived was to test it out in some aluminium stock. Surface finish was terrible no matter how I tried dialing it in. So I set it aside since. Recently, I came across some inserts via some promo emails and saw some inserts are made for aluminium and softer material. But I couldn't figure out which I shouldn't get to give the Facebook mill another chance. No reply from CTCTools since I wrote with my question weeks ago. They used to be very responsive. But I've not dealt with them for years. 

The face mill has the model number TP16-50-22-3T. Googling around I saw the insert type TPMN1603 instead for this model number on AliExpress. Thus the confusion. 

Can anyone help me to figure out what I should be getting for aluminium? 

Thank you. 
Wong