power multiplier tile (or platform) does not multiply power of tower, as the name implies. Instead it gives a flat bonus equal to the amount. This is not an issue for low research/xp but scales poorly into endless. Currently in beta, powerful ability multiplies power after taking power from power tile into effect (as it should).

example:
tower with +200% pwr goes to +225% pwr with current Power V tile
tower with +200% pwr should go to +275% pwr [(300*1.25)-100] if Power V multiplied power , giving 3 times the bonus.

Solution:

1. Keep everything as is and change name to "power bonus" tile, give +x% power instead of 105%, 110%, ect
2. Change the tile so it multiplies power as advertised