Dave Clark

I'm all good on that front mate, my mapper is golden.
 

You should certainly make yourself familiar with how PCLink works, the forums here can provide you a lot of support and assistance, and will save you having to go back to a tuner every time you want to make a minor change!
 
I would also make sure that you tell the tuner up front that you want full access to the ECU's configuration/tune when they have completed their work and you do not want it locked - if they are unwilling to to do so, then respectfully tell them to cancel your appointment, and that you'll go elsewhere!

All of these are possible. I suggest you download and install PCLink (if you've not done so already), open it up, open an Evo base map, then also open the Help file, and start looking at the options and the help file.
The Help file provided with these ECUs is the best sets of documentation I've ever seen - not only does it tell you how the software works, but also gives you help and advice on tuning, engine electrical systems and ECUs in general.

Relatively confident we have a solution for this unfortunately it does require a hardware change, Units will need to come in to the nearest office for the work to be done. 

Laptop 1 year old & problems started after loading G4X PC Link. Could connect to G4+ & older as well as other ECU's no problem. Tried all ports, communication, baud rates etc no go. Laptop under warranty - replaced motherboard. All fixed.
Tested again on G4+ & older all good. Bench tested G4X monsoon as was ok first time to unlock code.
Plugged into vehicle - device manager  showed as connected USB comm port. but Link G4X wouldn't connect. Updated firmware, updated drivers. Removed reinstalled G4X etc etc.
So after 2 hrs with David Link UK & team viewer we found a pattern. Update firmware/ update drivers, disconnect & cycle power on ecu & laptop & reconnect & would allow connection - until I cycled key on/off on vehicle & wouldn't reconnect.
Long story but fix was changed following settings in Device manager
Device manager / port settings / advanced
USB Transfer sizes  Receive (Bytes)  - set to 512   / Transmit (Bytes) - set to 4096 / Latency Time (msec) 2 / Time outs - Min read 100 - Min write 100
Can now connect & tune ecu - but is still bit clunky with process speed.
Hope this helps
 
 

Yes that should work ok.  Also Cartek and Track formula have something similar.  

Check your firmware is at least 6.16.27, if not up date to the latest and it will likely solve your problem.  It sounds like you are suffering from the offset being out by 360.