Many of us who live with Peg type tubes, have adapted some simple techniques to help. Many of the tubes with attached whips - the whip can be folded and held, pinched over, with a rubber band. It keeps them from leaking and doesn't seem to weaken the tubing at the fold. Those with really long whips can be folded over a couple of times and 'stored' that way between meals - without the velcro or the lanyard.
I gave up trying to the use the plunger of the syringe. I insert the tube of a 60cc syringe in the end of my tube, and pour the liquids into it, gravity feed, using it like a funnel, no plunger.
Eat sitting down, reclined a bit if possible, belly relaxed. Pour the meal in the tube and let it slowly drain in. Finish every meal with lots of water. Your body needs it and the water rinses out the syringe and the tube. Whenever the tube doesn't look super clean, pour in some ginger ale, or fizzy soda water - it cleans the tubes out very well.
Go to the pet supply store and buy some long skinny aquarium brushes. They will keep your syringes and tubes sparkly clean. Pour warm water into your peg at the end of each meal - the warm water melts away the residues from the food.
When you have a choice, get a 'button' type tube installed. It has no attached tube, only a plastic button, near your skin, with a vinyl flip valve to cover it. The button contains a one-way valve that prohibits leaking. The feeding tube hooks on with a twist lock motion and the syringe attaches to the tube. This type of tube is SO much easier to wear, easier to use and keep clean. The tube is held in place with a small bladder of saline inside the stomach.
I've lived with my peg for nearly three years now. Hope these ideas are of some use. Tom