i would not feel comfortable at 60lbs. i lowered my limbs to 60lbs and did not like it. i currently shoo at 67ish just because thats where i had it set. i didnt like 60 because i noticed the diffrence and wasnt as accurate. just felt wierd and seemed like i had no resistance..thats just me..

for you i say if you can draw it smoothly and comfortably and hold it back atleast a minute or so you should be OK...should beable to draw it straight back without straining IMO.

about mechanicals......i read that you want atleast 260fps and 60lbs of KE . dont know if thats true or not.....but id want a good bit of KE if i were shooting mechanicals just because they use some just to open up. and if they dont open up they are about useless...