OK this list istrue to the fluff but not easy to win with.
As a rule I'd say try to save points to fill out troops jet bikes are good but I think you need more
my advise loose guide far seer will be moving towards enemy flat out leaving war walkers behind. He is joined to a close combat squad and his transport is twin linked any way. All other units are twin linked or BS 4.
Destructor is a good pick for warlocks as you are going to be out numbered.
Conceal well for one unit a good strat will be in placing objectives. in both obj based missions you can place an objective in a place where wraith guard can get to and in cover. To maximise the tough nut to shift place then in reserve when they come on they run on to the objective the longer they stay off the less time foe has to get rid of. Enhance is a good power for this squad.
Star engines not essential
how about vypers instead of war walkers. Their speed gives them a great contest ability. at the moment you have 2 things to rapidly contest and jet bikes most things can deal with. Keep them seperate Put them in reserve and they can motor on flat outand yariel can help with the reseve roll
davel