As everyone else has said.
If you are still having trouble try this;
You said your entry and descent was ok, so what you need is some sort of reference to tell you when to initiate the flare.
During the descent keep the scan going, do not get tunnel vision or fixate on anything.
1. Set yourself a gate (autospeed correct, aircraft straight, RRPM mid green at say 300ft AGL). Have the aircraft in position at your selected gate height. YOU CHOOSE the height!
2. From this position you are going where you are going (as mentioned before) so eyes outside.
3. If you are still having trouble picturing the initial flare height try and visualise something you know that is the same height, like a hangar or a utility pole. This will help give you a cue to when to commence the flare while you are still looking out at the horizon.
4. As mentioned before talk to yourself and thus talk yourself through it.
5. Whatever happens (even if you have more ground speed than you would like) level the aircraft (re skids) back to the hover position (2ft) prior to ground contact. This should avoid tail strikes.