Depends on what hybrid stringing you do.... its all a matter of preference.
Most people hybrid coz they want to get the best of both worlds, ie durability and feel.
But what most people forget is the gauge, sometimes when we try hybridization , take for example say we put blackcode as a main , but we forget its 18G , as a cross we put in a synthetic gut 16G , well to be honest that combo suxs, its like mixing rocky road ice cream with lime sorbet...... unless you are very eccentric I doubt that combo will cater to your taste.
In general a stiff string as a main kevlar/poly allows you to hit with more spin/bite, opposed as gut /multifilament as a main this will provide more feel.
If the stringer recommended stringing same string with different tensions, I suspect they did a two piece job, ie same string cut into 2 and strung that way, its easier to string but tension drops more rapidly than a single string job.
Where as a single string job takes more longer and is more tedious to do, but tension will not drop as rapidly as a 2 piece job.
I have been told the reason why stringers string a higher main than cross, as this inhibits the main from moving.
so meaning to increase the sweet spot on the racquet face, the mains is higher than the cross ?