I own a BMC Teammachine SLR and I strugle a bit on the ascents. Can you tell me how this frameset compares to your BMC?
if you have an SLR and struggle on ascents, it's probably not the bike. could be the fit, could be fitness. sorry to say.

My SLR01 is a 2015 model, so it's quite different. rim brake, dura ace di2 11s, enve rims... However, the overall build weights are basically the same, as is the geo (BMC in my size = +5mm reach and slightly shorter chainstays). The BMC seems more compliant in the right spots, while the LTK is stiff all around. the tavelo integrated bar stem i have on the LTK could also be contributing to that stiffness. The BMC has that 'special sauce' while the LTK is more workmanlike. But it gets the job done. I'm faster on the LTK. I enjoy climbing on it. And I love having disc + Force E1.