Change the (most likely) 1/8" main gear wires to 5/32", that will make it less likely to flex/bend. For the nose gear get a Fults set.
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Put some 1/2" tristock backing on the firewall to strengthen it up. If you have to remove covering and balsa on the main gear mounting blocks, you should put some tristock on the supporting gearblock/wing rib junction as well. Most ARFs are weak in this area.
First off, though, the stock gear provided is way too flexible, you need to increase the diameter of the wire.
Don