Hi, I am also not a high elo player but I play viktor alot espcially in solo / duo que. Me myself never get mana reg on him, if I am like vs ap close range champs, or who when they initianate need to get close ( thinking about like ahri or diana or something ) I always rush abbyssal and it wworkes great. just get that hexcore upgr for your Laser ( e ). And with abbysal in you're hands if someone dives into you, you lower there mr with around 20 somewhere, so you got more dmg and you also have the mr and ap to be more stable in lane vs your opponent. Than just get your deathcap and max hexcore. . . . The abyssal is also grat vs ap comps and if you have alot ap, will also increase your dmg alot in tf! cuz your so ap AOE reliant!
Some mana reg should be fine and you should deffinetly do whatever you want and you feel like. but i feel like i cant rly miss dmg and need to go for that mid / late game spike! I only get morrel vs high reg comps or players who just are able to heal alot, think about swain, akali etc.
But just think about how you use your spells in lane, mind that if you always use your e for cs you will lose alot mana while you can also last hit them with your aa, and you throw your main dmg spell into csing instead of zoning and poking your oppenent, it will take away alot of viktors pressure.
But i think maybe athenes could also be fine vs ap burst champs, and youll get some cdr and bit ap, and crazy mana reg. . . but i dont feel like you will need it.
Also late game your hexcore will give you enough reg. just b inbetween and try to get some blue buffs from your jungler.
sorry for the long msg but just wanted to say this shit, i hope you can benefit from it :D
GL & HF