I built up an inventory of over 20 level 1 xmp bursters, and thought that would be enough to take over a low level portal – not even close. However, I did finally notice that I did different amounts of damage to the resonators depending on where I stood. I started off standing near the portal, but only did about 1% damage to each of the surrounding resonators. But if I moved closer to the resonators, I did up to 8% damage to that one resonator, and a little bit to the others resonators in range.
Is it faster to detonate xmp bursters on the resonators or on the portals for maximum damage?
The basic rule for a single standing wide spreading portal: you start on top of the strongest resonator and once it is almost finished you move to the opposite side or if there is a high level resonator (say 6) which is not at the opposite side you should take it anyway.
You can do finishing blows from the middle, even from xmp 1 all resonators get 1-2% damage.
Actually portal takeover is very tricky and situation specific, sometimes you have multiple portals close by and this requires other tactics, sometimes you have unreachable resonators and this is something very different.