GW Report - 2-2-16

Is there a guide to GW that shows how match ups are created? I have two accounts and my main account I'm at lv 66 and usually ranked 500-700 in PvP. My other phone account is lv57 and in the 1600-2000 PvP rank. My alt account GW starts my opponents in the mid 30's and tops off about 47-49 in node 9-10. I've cleared it 9 times in the last two weeks. My main account starts me at lv57+ and I generally only make it past node 6-7. I'd have to dump weeks worth of droids/credits into my B toons to make it past GW on that account. Is it worth it?