thank you very much, that is fixing the initial louder hit 
do you have suggestions for handling higher trigRates at around 50-100 more smoothly?
Synth(\grains, [\trigRate, 55, \freq, 440, \overlap, 0.25, envBuf: ~customEnvs[1]]);
ive seen this other thread whichs seems kind of related to this topic:
ive tried out to swap Playbuf for PlaybufCF but thats not as smooth as i was expecting compared to silky smooth with the same perc envelope and GrainSin.
Ive also looked at Osc1 which is not working together with Pmono i guess.