Last week, I shot 150 rounds through my G43 using the Taran +3. Not one issue or jam. About 35 of the rounds were Fed 147 HST with a mix of +p and standard.
I have not had any issues with my Taran +1, +2, or +3 yet... How is the spring tension? Do any rounds rattle in the mag when fully loaded? It can be a bitch to get the +2 and especially the +3 bases on and I have bent the mag spring getting the damned thing on (Taran sent me new springs for free after a call). But it may be possible to bend or bind up the spring. Or maybe there is a rough spot or burr on your feed ramp. It can be very frustrating diagnosing a problem like this.
I fantasize about a Glock OEM 10 round mag for the 43. Maybe also an OEM +2 base giving us a 12 round mag for spares. Maybe one day. (I have not tried the ETS 12 rounders. I prefer OEM mags).