ok justin, let me try. first off, are you using stock tx? ok, tell me these things, you climb up to 5~10 ft, do you raise the throttle or do you not move it? so before it starts to drop, the headspeed really dies off? right? and it'll sink to ground effect and can only stay aloft in ground effect? so try these first:

eyeball the pitch of the main blades, make sure 0 or -1 pitch at 0 throttle lowest trim in normal mode. adjust with pitch control links.
if you are using a computer radio, reduce the pitch travel.
what capacity batts are you using? (i'd recommend not over 1000mah especially with that overweight gyro of yours and the dd tail) (best are tp910's)
no, i doubt that the few stock tail strikes will kill the 3 in 1. and the amp draws seems to be ok.
your main motor may be going, but not a high chance.

so, i'd strongly suggest you trying out this first, to elaborate on the first point. reduce the pitch so that you CAN'T get out of ground effect even with full throttle, but have the headspeed maxed out. i don't suggest moving the throttle trim up, as that will increase the pitch range while not the throttle range. so when your hovering in ground effect and screaming headspeed, increase the pitch until your compromisation between motor bogging and climb rate.

just to clear the throttle trim and why i don't suggest using it (with stock tx and motor anyways):
all in NORMAL condition:

low stick low trim, pitch = 0.
low stick high trim, pitch =0.
high stick (motor unplugged) low trim, pitch = approx. 10.
high stick (motor unplugged) high trim, pitch = approx. 11~12.

low stick low trim, throttle = 0.
low stick high trim, throttle = approx 5~10%.
high stick (motor unplugged) low trim, throttle = max (red led from 3 in 1)
high stick (motor unplugged) high trim, throttle = max (red led from 3 in 1)

thus throttle can't be increase when there's increase in pitch.