4+ buffed farms = good enough.
There is no need to use the full bonus although ideally yes you would like to.
Learn to let that stray tree be or chop it and immediately place a farm on top if it’s a straggler. If you can get 6/8 farms to get the bonus, that’s also good enough.
If you think about it, should you have to place extra Folwarks to compensate for not being able to use the full 8 spaces of each one, really you only lose 125w. When you divide this wood by # of farms, really it means you pay like 50-60w extra at most for each Folwark that has HIGH inefficiency (i.e. has like only day 5/8 farms with the bonus).
But really, these considerations pale in the face of security of your eco. The #1 priority is the fact that your villagers must be safe from raids, losing vills cuz u have amazing Folwarks but far from TCs is MUCH worse than not getting the full bonus (which you aren’t meant to get anyway on maps besides Arena & similar, it’s not an all-or-nothing deal, it’s meant to be somewhere in between).