my tomos targa has really shitty brakes. i used to be able to skid and stop really quickly. so a couple days ago i bought new pads. i put them in and tried the brakes. and they were almost the same but a little bit better. so then i did a test, i took off the back wheel(easiest to do) then i took 80 grit sand paper and sanded the drum and a little bit of the new pads. then i took soap and a rag and cleand the drum and the shoes. then let dry and reasembled. then i tried the back break....EXACTLY the same. anyone have any ideas? should i try to sand the drum till its all smooth instead of the cuts that are in it now? or any other sugestions would be great.