New bike, new clutch. No point in replacing new components. Stiffer springs are also not needed. Sounds like as previously mentioned you need to adjust properly. Find factory spec for lever free play, it's usually 5mm or so. You should be able to shift without the clutch at high rpm, just put very little pressure on the shifter, chop the throttle briefly and pop it up a gear and get back on the gas. If you can do this with no problem, I'd take a closer look at clutch cable adjustment. If you can't do this, the issue is with your transmission or your coordination.
Also helps to know what bike you're talking about.