Smootchie

Hi Guys,
Did a tune after my build recently and the graph seems rather wierd.
Has some shuddering at 1.4k to 2k rpm. Not sure if its the AVCS.

Would appreciate the guidance from you guys on whats going on.
How else can i improve on the setup.

My build spec
07 WRX JDM 4EAT with sports shift SAVCS

Links G4x+
Ej207 lower case
Stroker 2.1 cosworth rods n crank
Mahle 92.5 Stroker Pistons
Ported heads
+1mm valves
Sti Cams
cosworth valve springs
Tomei Adjustable EX cam
SC42 TS billet
Hyperflow TMIC
Spec C EL headers
Spec C DP decatted
Spec C UP
Apexi Cat back
APS 65 intake
Walbro 255
1000cc injectors
Tomei FPR
TGV delete
12mm Oil pump
High stall TC
Modified valvebody
Hayden ATF cooler
HKS oil cooler
Koyorad Radiator
IAG AOS

Heres the graph.
1.6bar boost
Thanks in advance for the guidance.