I don't think there's anything wrong with using the nylon mounts like the Great Planes or Dave Brown ones for 4-strokes. I also have a Kyosho Flip with a Saito 100 and a Dave Brown nylon mount; it is plenty sturdy. I would not use the anti-vibe mounts precisely because of the weight gain. As mentioned by myself and others, to fly 3D as you seem to be wanting to do, you can't necessarily built for durability or toughness. You are looking for as light a wing loading as you can get. If you use full size servos, over-size tank, heavier engine mount, etc, it all adds up, and you are thus fighting a losing battle of bigger engine to hover, heavier servos, heavier mount, etc, and end up on the heavy end of the scale. It will be a fine sport/pattern flying plane, but not a 3D one...