Help ! About dm368 1080p at 30fps ??

I used h264 encoder ( version 2.0) in the newest DVSDK to run my application at 1080p, but I found it did not reach 30fps , only at 20 - 21fps. It's really exhausted me .  My  h264 encode configurations are below:

params.size                        = sizeof(IH264VENC_Params);

params.rateControlPreset  = IVIDEO_STORAGE;

params.encodingPreset     = XDM_USER_DEFINED;   //XDM_HIGH_SPEED;

params.maxWidth             = 1920;

params.maxHeight            = 1072;

params.maxFrameRate         = 30000;

params.maxBitRate           = 10*1000*1000;

params.reconChromaFormat       = XDM_YUV_420SP;

params.inputChromaFormat        = XDM_YUV_420SP;   

params.dataEndianness                = XDM_BYTE;

params.inputContentType            = IVIDEO_PROGRESSIVE;

params.maxInterFrameInterval     = 1;

extH264Params.levelIdc = 31;

extH264Params.profileIdc = 100;

extH264Params.entropyMode = 1;                           

extH264Params.transform8x8FlagIntraFrame = 1;

extH264Params.seqScalingFlag = 1;

extH264Params.transform8x8FlagInterFrame = 0;

extH264Params.aspectRatioX = 1;

extH264Params.aspectRatioY = 1;

extH264Params.pixelRange = 1;

extH264Params.timeScale = 60;

extH264Params.numUnitsInTicks = 1;

extH264Params.enableVUIparams = 1;       

//extH264Params.resetHDVICPeveryFrame = 1; 

extH264Params.disableHDVICPeveryFrame = 0;

extH264Params.meAlgo = 0;

extH264Params.unrestrictedMV = 0;          

extH264Params.encQuality = 0                          //2: for LITE

extH264Params.enableARM926Tcm = 0;

extH264Params.enableDDRbuff    = 0;       

extH264Params.sliceMode            = 0;        //0: for LITE

extH264Params.outputDataMode  = 1;       

extH264Params.sliceFormat         = 1;

dynamicParams.size                  = sizeof(IH264VENC_DynamicParams);

dynamicParams.inputHeight         = 1072;

dynamicParams.inputWidth          = 1920;

dynamicParams.targetBitRate        = 4*1000*1000;

dynamicParams.intraFrameInterval    = 30;

dynamicParams.generateHeader      = XDM_ENCODE_AU;

dynamicParams.captureWidth        = 1920

dynamicParams.forceFrame                = IVIDEO_NA_FRAME;

dynamicParams.interFrameInterval = XDM_DEFAULT;        

dynamicParams.mbDataFlag           = XDM_DEFAULT;

dynamicParams.targetFrameRate   = 30000;

dynamicParams.refFrameRate      = 30000;

extH264DynParams.intraFrameQP       = 28;      

extH264DynParams.interPFrameQP     = 28;      

extH264DynParams.initQ                    = 28;      

extH264DynParams.rcQMax               = 45;      

extH264DynParams.rcQMin                = 0;       

extH264DynParams.rcQMaxI              = 42;      

extH264DynParams.rcQMinI               = 0;       

extH264DynParams.airRate                 = 0;        //0: for LITE

extH264DynParams.lfDisableIdc          = 0;

extH264DynParams.maxDelay            = 2000;// 1000;

extH264DynParams.meMultiPart          = 0;

extH264DynParams.perceptualRC       = 0;        //0: for LITE

extH264DynParams.idrFrameInterval   = 30;

extH264DynParams.mvSADoutFlag     = 0;

extH264DynParams.enableROI            = 0;

extH264DynParams.intraSliceNum       = 0;

extH264DynParams.enableBufSEI       = 1;

extH264DynParams.enablePicTimSEI = 1;       

extH264DynParams.rcAlgo                 = 1;       

extH264DynParams.metaDataGenerateConsume = 0;

extH264DynParams.resetHDVICPeveryFrame = 1;

extH264DynParams.sliceSize               = 0;

extH264DynParams.intraThrQF          = 5;

Can anybody tell me what's wrong with my application ????   

By the way, I found the user guide of the newest h264enc introduce a LITE mode. can  the encode  reach 1080@30fps only by setting LITE mode? 

However, when I open the LITE mode by setting

params.encodingPreset           = XDM_HIGH_SPEED;

extH264Params.encQuality      = 2;

the H264 encoder creating will fail,  so I can not run my application in LITE mode. Is there something wrong in my setting?

Your kindly help is greatly appreciated. Thank u very much!