It could be the clutch cable needing adjustment. With so few miles I highly doubt its the clutch plates themselves.
Do you have any free play in the lever before it actually starts engaging the clutch? If not the clutch could be engaged even when you are not pulling the lever causing the bike to rev and not accelerate under heavier loads but not at lower speeds.
07 Victory Vegas 8 Ball
Rpw Slash Pipes, S&S Intake, Lloydz VM-1 Cams, Lloydz VFCII, Lloydz extended rev ecm, 1/4 turn throttle, Oem Tach Kit, Hammer V Bars, Barnett clutch, Bullet Headlight with HID, Ness black retro derby covers, Black ISO grips, Mbw led front signals, Black Ness rad II mirrors.