You need to add support brackets that goes from top of lamps trough grill to metal body of car, thete is good space to mount brackets next to bonnet hinges. It does make lot of difference, virtually no wobble at all if made properly, small tension keeps them from not vibrating.
Also such brackets are handy for adjusting spots, I have found best adjustment for visibility is such that extra spots starts where car's main beam stops, so that there are no gap, but also no overlap. Also I tend to adjust them so that they lit mostly edges of roads, that is useful in corners and often it is not road where danger lies, it runs to road from forests, so best to see danger before it comes to road.
I have been extra spots user for over 10 years, they are must in here, but good lights seem to be also illegal, nobody really cares, maybe they understand that it is cheaper than hospital bills from hitting wild animals
My favourite lamps are FF320 Jumbos with HID kit at the moment, great performance for dark autumn weather, but don't look very nice.
Volvo 360GL -88 -under restoration-
Volvo 343DL vario -81 -running-
Volvo 240 Diesel -83 -undecided-
Citroen ZX Dturbo -97 -daily-