Roger,
I flew my 4* with a 46LA.
I fly my WM Mach II, a similar plane, with a 40LA.
The 46 in the 4* was lots of power.
The 40 in the Mach II takes a little more runway to get up, more scale like, but flies at 1/2 to 3/4 throttle with no problems.
Give the 40 a try, there's a lot to be said for reliability.
And, your plane doesn't need to jump off of the ground.

Good Luck,
KW_Counter