I mixed TFA Peach at 10% with a 50/50 VG/PG Mix. It was ok just after mixing and got better with steeping, no foul or odd flavors just didn't seem to come through much but steeping did help. I don't do flavoring over 10%...just my personal rule. I use to but I found less is usually more and higher can result in some pretty foul taste.
During my next mixing session I tried 5% TFA Peach and 5% TFA Brandy with a 50/50 PG/VG Mix and WOW, this simple mix is one of the best flavors I've done, they seem to complement each other nicely, definitely going to be a mainstay with me. I can taste the peach more at 5% with this mix than I could at 10% alone. I did find the Peach came through just a wee bit more than the Brandy so next I may try 6% brandy 4% Peach but it's an awesome mix for me whichever I might perfer, again steeping did help but this one was great from the start.
Same thing with TFA Strawberry, I tried it on it's own at 10% 50/50 and it was ok. Then tried 5% TFA Strawberry and 5% TFA Peanut Butter and that mix was also awesome. For me these flavors seem to work better together rather than alone. I've tried all 4 of these flavors on their own at 10% and they all were ok but mixing these together at equal parts of 5% just intensified the overall flavor and they seem to go well with each other so you might want to give that a shot. It could be if I tried just 1 at 5% I'd get better results but I'm loving these two combos.