The tuners are not good compared to my Dreambox 800HD

Tuner A: GIGA DVB-S2 Internal NIM (DVB-S2)
Tuner B: GIGA DVB-S2 Internal NIM (DVB-S2)

Just to give an example, using my Dreambox 800HD, I manual scanned on 108.2 S-band and I got 120 services.

But using GB Quad on both tuners, I only get 77 services.

Another problem is when I switch channel on other satellites, all the transponders from all the satellites lost signal.

I'm using Diseqc 8x1.

The configuration as follows:

LNB1: Sat1 Diseqc 1.1 Ku-band
LNB2: Sat2 Diseqc 1.2 C-band (no USALS) (68.6E-166.0E)
LNB3: Sat3 Diseqc 1.1 Ku-band
LNB4: Sat4 Diseqc 1.1
LNB5: Sat5 Diseqc 1.1
LNB6: Sat6 Diseqc 1.1

I tried to flash the box using images from Openmips, OpenAAF and OpenVIX but same result I get.

Could somebody please help me on this.