You will probably laugh your head off if you realise that the peers who branded me a jammer are a head taller than me and 25 or more kilo heavier than me and can out muscle me anytime they want to. One or two will not hesitate to put their 80-90 kilo bodyweight on my elbow in a nikkyu lock with less than 6 inches of space between the face and the mat. They will not hesitate to remove your hand from the wrist in sankyu. For shihonage or iriminage, if you are lucky, their follow through can be just 3 inches about the mat, if not, it is 3 inches below the mat. All these, they won't be telling you and so much for good ukeme practice. If you are beast, then I don't know what to call them. At the moment, they are just Pain, Painer and Painest. BTW, Painer and Painest are the Yoshinkan guys disguised as aikikai beginners.
It may well be a clash of styles if your yoshinkan peers are branding you a jammer. BTW do these yoshinkan people really say you jam them?....strange! cos up here it is usually the other way around. Again, it is a clash of styles and development. Yoshinkan aikido builds stability first and fluidity in movement much later (IMHO). With this, intermediate yoshinkan is characterised by huge doses of resistance training, but usually this type of training is cherished (by the yoshiners) and not a matter to argue over. If the akikaiers complain....then it makes a bit more sense.
Moreover the P,Pner & Pnest cannot be "Yoshinkan" as nikajo is mostly done with hands extended 'kamae' so not very likely bodyweight can be applied to uke's elbow. Even from "kata mochi" both shite's hands are on uke's wrists.
Similarly for iriminage, yoshiners have been called robots/zombies here with the final zanshin(stance) with both arms and back leg extended. Definitely finishing more than three inches off the matt for normal practioners and more still if they are 25kgs heavier and half a head taller than you.
Yoshinkan sangkajo is mostly a single handed "pistol grip" lock with thumb and forefinger extended (opened) and usually less "tearing" than the double handed "wringing" or the lower hand twist of uke's fingers towards the armpits. The sangkajo nage is led by uprooting with less of the whipping down.
Shihonage, I agree as it is the yoshinkan practice of taking it all the way down to the mat with one final slide of four/five feet. Not vertically down though, so ukemi is still very "do"able.
You best check cos maybe your peers are akikai BEASTS putting on yoshinkan airs to disguise themselves as akikai beginers.
Happy training OSU!