I've got a similar sized Spit, it is an old PICA Spit, 65" span and ASP .61 in the nose and has flaps. Mine does similar things if I am not careful. I find that what helps me is to drop the gear into wind the peel off for the downwind leg reducing power to about 1/3 then lower flaps and retrim for level flight.

Turn to base and reduce power then onto finals by this time just a few clicks of power and trim for slightly nose high attitude. If I let the nose drop below 5 degrees it is a pig and will dive for the ground but as long as it is trimmed slightly nose high it is sweet to land. I just jockey the thottle then cut it when only a few inches off the deck. The flaps pull it up for gentle 3 pointers.

I have made the mistake in past on take off of wrenching it off too soon which gives high AOA, low airsped and results in violent snaps and roll into the deck. Very similar to what you experienced.

I don't think it is aradio problem but more a landing technique and could be CofG too. Spits are very sensitive on elevator at the best of times.
cheers
Pete