well t17 is a scheme where there always will be a luck factor even if you edit it.
- random start positions -> sometimes the opponent is abled to plop a worm while u didnt had a turn yet (with bt/fp/db/drill). That always will be. Specially in 2on2's but yeh, then you just should block that area off but there are examples that they couldnt get the girder in such position.
- crates -> you never know which weapon is in which crate.. Even if you catch 30 cr8's and the opponent just 15 cr8's there is a chance that he got EQ + Patsy while you just got one pidgeon. Still I think if you noticed you catched the most crates and the opponent doesnt have such arsenal as you, you should try to do as much damage to him as possible and even then a scale of justice could screw your ideas and you are still left against one/two fat worms with no SD arsenal.
7 girders or unlimited girders.. 7 girders is a bit more speedy since the person which got the most HP/worms is abled to keep opening the opponent to put pressure on him and there will come a time he doesnt got girders anymore and then the game is ended pretty quickly. If you use unlimited girders you still can make a comeback if you didn't collect the right weapons or if you are screwed by some banana that he used on you before SD so you just stay on one side getting some crates and let SD decide the game.
Ofcourse the most important is to get the biggest cratezones, get the best side for the SD, edit your own tactic by the weapons u catched.
How about 'get rid of the banana's/vase/holy's? That won't work at all. Example: player1 did collect 1x pidgeon 1x aqua and you didn't collect ANY sd weapon and you only got 'low powered' weapons so you are also not abled to push him. IF you had this weapons u could even suggest to teleport to him to put pressure on him or let him think u got something terrible in your arsenal. If you would edit all those powers and strong weapons people would be just like 'ah, 50 damage of uzi.. I can deal with that'.
I really don't see a reason to edit the scheme. Some maybe prefer the FB scheme or the scheme of HHC but in the end its all down to the player and to your tactic. If you are a good t17 player you will get 75% of the crates at least and this will be enough to give you the advantage to win the game. Sometimes you just can't get the correct weapons out all those crates and the opponent hits the weapons he did need, well... That can happen! but that's what makes it fun. You never know how it will end because you can't look into the opponent his arsenal.