When you tighten down the top cap it will pull everything closer together if there is only a few mm between the top cap and steerer tube then it might not be enough to get the correct tension. There is no harm in cutting a few extra mm off to be sure. It would be worth mentioning that I have all 4 spacers below the stem so the top cap is pressing down directly on the stem this also allows more tolerance in the steerer tube length. I would try putting the 4 spacers to the bottom of the stem first ditch the top one and check the clearance if it looks close to the top of the stem the cut 1-2mm off. Like I said it worked for me but everyone's bike id different.
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