Well just know, from my experience downsizing and going softer makes you a better jibber short term, but long term it limits you. I stiffer board gives you more fine control.
Get the 148, jib the hell out of and kill it, then get the 151 next year.
Go ahead, drink that kool-aid.
FS: Forum Sauce 142 $200 plus shipping
FS: Flux SE30 $75 plus shipping