Some people have problems tasting strawberry in juices. And some don't get on with s-berry's from specific flavor houses. Don't know if that's your case here or with all s-berry juice. You are on the right track, a tiny bit of raspberry will enhance the strawberry flavor. Or watermelon. But be careful cause raspberry's are strong and will take over fast. I would start with a single drop.
If you really like a strawberry vape I would suggest getting both FA Strawberry and FA Juicy Strawberry. The former gives you the overall strawberry and the latter is more of the ripe sweet meaty berry. Together they're very realistic.
IMO the most realistic raspberries are INW Raspberry WG and FA Raspberry. Both are STRONG so go light. I've used them from a single drop up to 0.5%.
I'm not at all sure where to suggest flavors for NZ or OZ. Chef's Flavours in the UK is a great place, I buy from them as do many others here. Bull City Flavors in the US is another one. IDK for sure but there are probably stores in NZ for you to order from.
@AngeNZ,
@Pigs and
@Fredman1 would know best.