hi everyone, i'm new to e-flying and decided 4 days ago to buy an aero ace... this thing is very fun to fly. my back yard is full of obstacle and i getting better at avoiding them. have to admit thou that the first 2 days the plane ended 4-5 times in the pool, but it's a good thing it's foam

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i already made 3 mod to my aero ace. 1- remove the throttle spring. 2- the steering w/o throttle mod. 3- one of my own (but i'm sure lot of people here did it) using a 8xAA nicad pack. i used a voltage regulator (AN7805) to feed the third wire (1-grd, 2- +9v, 3- +6v). everything goes very well.
i only have one thing, that i think it's a problem. i don't know anybody that flyes or got this airplane, so i need your help. i really have problem to glide... when i'm at the lower throttle the plane flyes at an angle of 10-15 degrees and as soon as i release the throttle the plane climb a Little bit and then stall. after 15 feets of falling the nose go up climb a little bit and stall again. it does just like a sheet of paper you drop. i feel like the plane is tail heavy, am i right? i read people here that place the battery more to the nose. i would like to try that but i don't know how to open the plane to get there... and i don't want to wreck anything.
can you help me with that??
and at last. does cutting away the nodules really help or do anything? the way they are placed they could also work as "vortex generator". some full size aircraft got these, if i remember well some Cessna (170-180 series), Fokker-100 and md-80 got some. it "lighten" the air on top of the wing witch increases lift.
thank you.