Depending on class of motor, surge currents of 5x are normal, until back EMF from motor increases as speed approaches steady state to cancel. Motor may have some Remanence in iron core such that phase of stop current if opposite phase to next start will minimize surge from preventing momentary saturation of core. This is by chance.
If motor is shutoff by Triacs at zero-current crossing, then best simple start time is using ZCS trigger for triacs using any method.
Since motor is designed to handle this momentary heat load or may use starting Caps to improve PF for starting to improve torque, your Triac switches must also be capable of such surge currents.
Coil Rs determines the maximum torque and also maximum inrush currents. Motor torque and compressor Load profile with inertia determines the time of surge current. Underpowered motors will increase duration of surge time.
Is your problem overheating of triacs during startup or effects of surge current on Line voltage regulation and other devices?