My bike takes a real effort to manual and wheelie. I'm not really bothered about wheelies, I'm too old, but a manual is a useful tool. It seems way to hard compared with other bikes I've ridden. Before all the riding gods start questioning technique, a friend has a Blue Pig X that I find very easy to manual and easy to balance.
The bike is an Evil Sovereign, which is supposed to be a 'manual happy' playful trail bike, but it just doesn't seem that way. Even lifting the front over obstacles takes a big lean back and big upwards tug on the bars. The blue pig just lifts the front wheel with a lean back.
I'm running Rev single airs, Single Ply lightish tyres, Flows, short stem, wide bars (740), so I'm not sure it's a weight issue. The rear stays are adjusted about halfway which is a good compromise, and still short.
Not really sure what else there is to change?