np2 trigger mods (cbt trigger)

hey , guys, in light of awesome deal on a jim shockey steel eagle for under $90 from crosmans website when used with the 25% off agn coupon (thanks agn !) , can yall teach me a better way to have a decent trigger on my two (steel eagle & black lightning) ?? i've found when i use too light of spring, it wont cock. i know it wont be a rekord trigger , or even my favorite in the industry - the uk longbow / tomahawk trigger...... but what do yall know ?