You will no doubt find Mod/Full to be a bit of a handful at Skeet (you either "smoke" them [if you're "on", you're "on"], crack them or miss them completely ! [and if your not, your not] ) but O.K. for 5 Stand. More than once I've just left the Lt. Mod. chokes in an O/U or semi and just shot .... a couple of rounds of Skeet, a couple of 5-Stand ... then out the back for a 100 Sporting. Surprising how well you can do when you focus on the targets and not fiddle with your loads/chokes at every Station.
Skeet targets are invariably shot at something like 22 yards or less. Most 5-Stand Target presentations are 30-35 yards ... and often closer, and for the most part, most Sporting set-ups are well within the 35 yard range, with only a few really "long" stations. I watched a fellow shooter shooting 60 yard crossers with a 20 ga. with Imp. Cyl chokes ( that's all he had with him in the gun ... he'd forgotton the rest at home somehow ) you should have seen the breaks he was getting ... with Kent 7/8 oz target loads of 8's. Optimal ... probably not, but as I recall he was "even" with the shooters using lots of choke in 12 ga. with 1 & 1-1/8 oz loads of 7-1/2's.
One of the nicest rounds of Sporting I witnessed another fellow shoot was at Uxbridge a couple of years back .... a 96/100 with CYLINDER chokes left in for the entire round. (And two of the rabbitts he missed, he likely would have missed anyway ... no matter what choke or load he was using ... bunnies were his personal nemisis ! )
Trap on the other hand ... well, light mod is generally just not enough for the steady diet of 34 yard + targets from 16 ... and certainly not enough for the
stuff from the back fence.
Yoiu should be able to get the existing chokes reamed/honed out for something like $50 - $75 per tube. With 101's, it's also worthwhile, IMHO, to have the forcing cones lengthened and polished at the same time.