That's a big NO on the flaperons, if it tip stalls on you now it's telling you something and theFlaperons will make your problem worse when you try to land. By being at slow speed and gassing it too fast will cause the plane to want to roll left, happens all the time. You roll on the throttle to avoid this. Any of the warbirds I have flown require a bit more air speed when landing and you fly them in close to the ground then cut power and they will settle down and land all by themselves. Do a search with the key word Flaperon and see what everyone has to say about them. It's been a topic all the last week or two and it comes up about every month. They have there place but it isn't on a warbird.
Good that you were able to maiden your own plane. I used my advanced instructor for a long tim until he had a stroke. Then I figured I was as good on the sticks as any of the other pilots so I may as well do my own. It's worked out pretty well for me over the years.