6s drop off

[spcpicard]

Ran my 8ight T first time Thursday, than raced it Sat in the Louisiana point series. I am running a MMonster esc with a Xcelorin 1300kv motor with a Hyperion 30c 3200mah 6cell. The qualifiers went fine, but during the main I noticed a considerable drop in performance after the 5min mark of the 10 min main, I burned 1801 mah in about 10mins and 20 sec. I am geared 43/15 which is calc for about 39mph. I noticed the same thing from practicing with it on Thursday so I increased the timing to 10 and I thought I would be good, but during the main on Sat, the extremely noticable performance drop casued me to drop from 3rd to 4th. My question is, is this normal when running 6s packs? I've run 4s and 5s pack and all of them have a slight drop off but none were nearly as noticeable. I am guessing that maybe it's just that the xcelorin motor just isn't providing enough torque? Any how I just bought a tekin 1350, but now I am going to be worried about the rotor sep issues. Any ideas would be appreciated since I am new to the whole 6s and truggy deal. Here's some pics of my new ride.





BTW if anyone is in the area, the LA point series had 16 in the 1/8 ele buggy class and 8 in the e truggy class....it's really taking off!