4K export best settings for go pro 4K content

Hi

I've attached a media info report of the go pro 4k files which are very high quality when played back directly. However when I edit through HitFilm 4 Pro and use what should be high settings e.g. profile 5.1 and variable bit rate with target of 45000 mbits/sec and max 45000 mbits/sec the output is very blocky

Can you recommend the best settings so I can get the video encoding without losing any noticable quality? I certainly had no issues doing this in Sony Vegas Pro on the Windows which I moved to before Hit Film. I love everything else about HitFilm so hope this can be resolved and can recommend to my colleagues too

Effectively I've done nothing with the original video except trim portions of it.

Thanks

Matt

* * * MediaInfo Mac 0.7.36.0 file analysis report.
* * * MediaInfo Mac is ©2010 by Diego Massanti - http://mediainfo.massanti.com
* * * MediaInfoLib by Jerome Martinez - http://mediainfo.sourceforge.net
Created on: 9 Oct 2016, 12:34:42 BST
Report for file: GOPR9829.MP4

General / Container Stream #1
Total Video Streams for this File.................1
Total Audio Streams for this File.................1
Video Codecs Used.................................AVC
Audio Codecs Used.................................AAC LC
File Format.......................................MPEG-4
Play Time.........................................4s 504ms
Total File Size...................................32.3 MiB
Total Stream BitRate..............................60.2 Mbps
Video Stream #1
Codec (Human Name)................................AVC
Codec (FourCC)....................................avc1
Codec Profile.....................................High@L5.1
Frame Width.......................................3 840 pixels
Frame Height......................................2 160 pixels
Frame Rate........................................29.970 fps
Total Frames......................................135
Display Aspect Ratio..............................16:9
Scan Type.........................................Progressive
Color Space.......................................YUV
Codec Settings (Summary)..........................CABAC / 1 Ref Frames
QF (like Gordian Knot)............................0.242
Codec Settings (CABAC)............................Yes
Codec Settings (Reference Frames).................1
Video Stream Length...............................4s 504ms
Video Stream BitRate..............................60.1 Mbps
Video Stream BitRate Mode.........................VBR
Bit Depth.........................................8 bits
Video Stream Size.................................32.2 MiB (100%)
Video Stream Title................................GoPro AVC
Video Stream Language.............................English
Date of Original Encoding.........................UTC 2015-01-02 02:33:49
Color Primaries...................................BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer Characteristics..........................BT.709-5, BT.1361
Matrix Coefficients...............................BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177
Audio Stream #1
Codec.............................................AAC
Codec (FourCC)....................................40
Audio Stream Length...............................4s 501ms
Audio Stream BitRate..............................128 Kbps
Audio Stream BitRate Mode.........................CBR
Number of Audio Channels..........................2
Audio Channel's Positions.........................Front: L R
Sampling Rate.....................................48.0 KHz
Audio Stream Size.................................70.7 KiB (0%)
Audio Stream Title................................GoPro AAC
Audio Stream Language.............................English
Date of Original Encoding.........................UTC 2015-01-02 02:33:49
Menu / Chapters Stream #1

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