i use 3ft hoses with cps low loss fittings atatched to the ends so i can choose to use them or not, depending. the issue that i have is they leak most of the time when pulling a vacuum, im thinking about switching to the ball valve type of low loss fittings but ive never used them before. with the anti blow back style fitting i like how you loose very little refrigerant but the seals tend to leak. Whats your experience with the ball valves at the ends of your hoses do you loose the same amount. in case you ask yes i bleed my high side hose back into the system through the low side, thats another good reason to have a low loss at the end of your hoses