Too much buffering

Hi to all

I have a Nuc 2802 with Openelec 6.0.3 stable version running Kodi 15.

I have an IPTV M3U list that i put it in the Simple IPTV Client and the same time i put it in VLC in my PC.

The problem is that in VLC i have very few buffering (every 5-10 minutes depending on the chennel), while in the same time in KODI i have too much buffering (every 10-40 seconds).

I have tried several options in advancesettings.xml concrning buffering but either i put small buffer or put high buffer the performance is still much worst than in VLC.

In some forums i read that it will be better go to Gotham as it was better in IPTV is that right?
Is it a good idea to go with new Openelec Beta that includes Kodi 16? Is Kodi 16 has any improvement in IPTV?
Should i use any other add on and not Simple IPTV Client (I have no interest in PVR and EPG functions)?

Any other suggestions?

Thank you