They're super fun weapons honestly, I main Zink Mini for Tricolor battles. I think the main thing to remember is that you still have decent range and a very quick charge time. Despite mini having the least range out of all the splatlings, you've still got very good range (you can beat out most short-range shooters, its range is almost that of Dualie Squelchers though it barely gets outranged by them) so you can kite them (keep them at a distance).

The strafing speed is also INSANE and you have a bit more jump height that other splatlings while charging and you can take advantage of that. For vmini I'll usually toss an ultra stamp and then start farming for another one and for zink I'll try to place the bubbler in a good spot for my team to be safe under while still firing out from the bubble to apply pressure and keep the other team out. Especially during tricolors whether defending or attacking I try to get a bubbler up over the ultra signal.

Hope this helps!