Delta Kitchen Faucet Model ******-DST*Purchased **-**-*****Two Problems: No. * is a fai...

Delta Kitchen Faucet Model ******-DST*Purchased **-**-*****Two Problems: No. * is a fairly recent problem, No. * is a long ongoing problem.**. The spray*stream flow mode rocker switch on spray head is extremely difficult to change from one mode to other. Requires so much finger*hand pressure my wife cannot change modes. Friend suggested applying silicon lubricant in the mode rocker switch. I did, but no avail, actually seems to make it harder to operate. **. When using spray pattern mode the water streams are not in a uniform pattern like they should be. Some don't seem to be spraying at all, some do not spray straight, very ragged pattern. Have tried cleaning spray head using white vinegar, no improvement. *Any help*parts you may be able to offer will be greatly appreciated.*Thanks in Advance, *Dennis