The Enerland 3200 might work. It's a little longer, like my 4350. That would be nice - basically a 4s 6400. That would easily get me through the 30 minute race. Interresting that the 3200 is heavier than the 3300 though.
A flightpower 3300 evo20 4s1p weighs 360 grams,i think those figures are off or just the weight of the cells and not the pack,the 3200 being 342g seems about right though.