Dave, every P-38 I've flown has been that way. It's not like flying a Cub, where you can just float in. A P-38 is a heavy wing loaded plane, so yeah you have to fly it till the wheels touch, they won't glide worth a darn. You fly nose down in the last part of the landing approach to keep the speed up, then plant it.

Honestly the E-Flite version was the only one I've ever had that could be somewhat landed at slow speeds, but that in itself caused another problem. By forgetting to fly it all the way down at speed you could get caught in ground effect, where it would want to balloon up just before it touched down. Was usually followed by an ugly stall as there was no speed left to keep it going. Would drop a wing and snap roll, cartwheeling to a stop. Followed by a lot of glue and CF reinforcements. LOL.

On my bigger ones, even with flap deployed to somewhat slow it down you still have the props spinning big time as the same still holds true, too slow results in ugly landings.
I doubt any of them come in at less then 1/4 throttle. Just my thing as if it starts to go wrong I already got em turning and can flip off the flaps and do a go around.

With out this type of approach, you are commited to landing, just how it ends up landing is going to be more up to the plane then you.