I think your issue is that your wireless network is not robust enough. You can try Airserver too ( below) but you will have the same issues unless you have a rock solid wifi connection. I use 802.11n, with an access point in the room, with 55- to 200 or so mbps connection. If your access point is distant and lots of others are not you will be disappointed.
- Beam your iPad or iPhone screen to HDMI or VGA projector, smartboard or HDTV via a Mac or PC
- True full screen display
- Picture enhancement settings
- Secure password protection
- Collaborate with students using simultaneous connections