Cymbidium leaves not able to support itself.

I have two cymbidiums since December. One is a standard Cym and the
other I think is the warmer growing Chinese cym. They both have been
putting out new growth for over 2 months now however the leaves can't
support it owns weight and bend/flop over on it self at 1/3 to 1/2
length up from the bulb. The growth seems softer unlike the older
leaves which are harder and arch gracefully. I grow outside in
Southern California under a tall palm tree. It gets direct sunlight
till 12noon then it gets dappled shade from the palm tree's shadow
till 2 pm then on to more direct sunlight. I water it 3x a week by
soaking the pot in Better Grow 20-14-13 at 3/4 tsp a gallon or roughly
200ppm of N. Mix is bark and perlite for standard Cym and bark and
fine gravel i think for the Chinese cymb.

Also the older leaves are yellow at the tip and progressing downward.
Some of the older leaves are also splitting lengthwise right at the
main support spine.


Could anyone give me some idea as to what is causing this?