I can't help with the specific differences on the models, but if you lose the anti tamper on your S410 and tune the trigger & clean up the hammer rail, you will get a smooth shooting action with a small fps spread in the sweet spot.
For HFT, having a different stock with adjustable cheek piece and butt and a single shot adaptor will all make shooting in comps easier.
If you havn't already done so, a visit to the Barbury club at Swindon might help if you need to see the different models in action.
L/H Pro-Target MK111 Burris Timberline 4.5-14x32 Ballistic Plex
L/H TX200HC Burris Fulfield II 3-9x40
L/H TX200 GinB
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