Thanks everyone for your great tips!
@ Larry, I do believe the air idea is a good one, the pack they sell for the plane is a 750 Mah - I purchased a 7 cell 1045 Mah.
@ Gamegeek, I will try the Graupner prop 6 x 3 How much more rpms am I looking at, I almost thought of going with like a 7 x 6 but with the 400 motor, might have been to much.

@ SierraGold - The addition of a gearbox- which would you suggest or did you use as well as the geared brushless? I do like the compactness of the glider!
Thanks everyone