Have you tried installing an AR6100 on your Big Lama? What Tx are you using for your helis? I have a DX6i. I'm wondering if their would be any advantages to flying the Big Lama on a DX6i. I'm guessing that you could turn up the servo travel adjust to get a bit faster forward and backward flight.
I have been using the STD Esky TX & RX and I was going to changes this because of the intermitted glitches with the STD Esky TX & RX.
I have now added the GWS R-6NII 6ch Naro type RX and using my JR PCM9XII TX and it is dead easy to setup, see below the channel assignment and the picture of the setup on the Big Lama.
STD Esky RX channels
1 = Aileron
2 = Elevator
3 = Throttle
4 = Rudder
GWS R-6NII 6ch Naro type RX
1 = Throttle (Servo Direction = Normal)
2 = Aileron (Servo Direction = Normal)
3 = Elevator (Servo Direction = Reverse)
4 = Rudder (Servo Direction = Normal)
Note: The above is a guide and will vary with different brands of TX & RX. Always remove the Blades and flybar when you are make these type of changes other wise damage to you and the helicopter will be the end result.