Ok so this might be a weird question. So I purchased the 6516/6519 Tx/Rx combo and it just doest seem to go as far as the 6509/6518 combo...is this supposed to happen? they both are 2.4ghz but since the 6516/6519 is the cheaper version does this mean that Its not gonna go as far as the 6509/6518 combo? im speaking about the range? any help is much appreciated.