I've never had to use a beard conditioner but I keep my beard fairly short too. Guess it depends on how long and how coarse your beard is. My first suggestion would be to switch to a milder and fragrance-free shampoo. Some fragrances can cause issues and that's why I've only used fragrance free shampoos. Besides I find most fragrances unpleasant and unappealing. There are some products made specifically for beards, if you want to go that route, Men's & Cremo are two of them.
If your beard (and hair) is a coarser texture, then you may need a mild conditioner especially if you grow it long because you may have split ends that may need to be trimmed back a bit before growing it longer.
I'd personally would avoid shampoo/conditioner blends, I've found they make my hair feel much to "greasy".
LTO_3