Sounds like you and your fitter should be working on this. Advice from the majority of us will simply be a guess, but your fitter knows your swing and can recommend the correct shafts for you.

Since you added "as cheap as possible", I'd really suggest working with a fitter. The wrong shaft will be a $200 mistake. Consider a fitting to be a $75 insurance policy.

Sounds like you are focused on long drive events. At a driver head speed of 134 MPH your ball speed is close to 200 MPH. These are number not seen on Tour!

There are a number of shafts that are very specific to long drive competitions and there are fitters that are also specialists in doing fittings for those guys. This is where to start. I would bet that you next shaft will not be cheap as the more exotic shafts that you will be looking at start near $300 and go up from there.

my swing speed is around 110...... x shafts are for me

134 mph sounds a little high. Anyway if you are looking for a less expensive shaft then check out the Graffaloy Blue series x flex. They sell for around 80 dollars each. Ask Henrik Stenson how he likes his.

Best bet is to go to a Titleist fitter and go through the process. Not a sexy answer but one that is going to leave nothing to chance.