OP do you happen to have an AMD Radeon graphics card? If yes then eyestrain/double vision/headache etc etc is most likely caused by that. I used to get a lot of eyestrain and severe headache when I had an HD6870 and enabled hunter mode on geth infiltrator. But after changing to Nvidia GPU I dont get eye strain & headache with hunter mode and other screen altering effects like bloodlust or rage.
Also you should try a game or two with Blackwidow on GI. It will allow you to circumvent shield gate a bit easily compared to Widow or you could use Phasic Rounds ammo on single shot sniper rifles.
If you skip last rank of Proxi mine and rank 5 and 6 on Tact Cloak you can buff shields and reduce shield recharge delay and combined with Stronghold package and shield power cells shields will start charging almost instantly. Getting tact cloak rank 6 and skipping 4 and 5 on Advanced HW will make GI truly a glass cannon and its a bit difficult to keep it alive during pug gold and plat games.
Try these two builds first one is for Widow and second for Black Widow (which is my fav sniper rifle
)
http://kalence.drupa...53X55373!5B89CS
http://kalence.drupa...53X55334!5BF9CS