Im getting back into bowling after a 'few' years out, joined a league and Im loving it again. At the moment Im using:-

Rotogrip Cell
Storm Trauma
Storm Barbed Wire
Brunswick Powergroove Dry/R
Spare Ball
 
Only problem Im having is that part of my equipment is too light for me, Ive moved up to 15lb balls, but my old Storm Trauma is 13.5-14lbs (cant remember exactly but its noticeable).
Im doing really well with the Trauma, but I am in the situation where I have bad shots because of the weight difference. So my question is, what to replace it with? I love the different type of shot it gives me in place of the Cell when it is struggling (Lanes in the UK are allergic to oil in most places), so I would like to get something similar.
Thanks for any help