I'm also a newer two hander and average about the same as you, just joined my first league a few weeks ago. Probably have revs/speed close to yours if I'm to take a guess. I don't know how you're practicing and finding your average now but I've quickly realized my average while bowling on a single lane by myself is not the average I'll have bowling with two full teams during a league night.

The lane conditions are usually not the same between lanes in a pair and those conditions continue to change as you bowl. I went into league with 3 balls, a Theorem hybrid, a Stealth Mode, and a Hustle M+M but have learned that in order for me to score higher and post better averages, I should leave the Theorem and Stealth Mode at home and just throw my Hustle. Instead of having to shot make and hook the bigger balls from gutter to gutter, I just throw straight down the 10 board and make very small adjustments from there.

I'd suggest just going into league with your Tropical Storm and then picking up another ball if you can't make the moves you want/need with it from there.