Downthrust will make it worse. You would need up trim in the elevator to offset the down thrust at high throttle settings, and that up trim would still be there when you throttled back for landing.

Having the tail drop on landing approach is a classic sign of tailheavyness. Make sure that it balances no more than 30% of the wing chord behind the leading edge with the tank empty.

Or it could be simply pilot technique. He may be flairing too early in the approach. As BillS says, 4 Stars are famous for floating on landings. Clipping one bay off each wingtip helps a lot.

Jim